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8/11/13 10:58pm - Reply: 'Re: Engine rattle above 2000 rpm'
daveo76
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 831
Man, sorry to hear that, Greg!  Bummer!  Timing chain, maybe???

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1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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8/12/13 8:27am - Reply: 'Re: Engine rattle above 2000 rpm'
Case75
Former Member
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
daveo76 said: Man, sorry to hear that, Greg!  Bummer!  Timing chain, maybe???

Thanks Dave. I haven't had a chance to start the post-mortem yet but timing chain did cross my mind. So did spun crank bearing and a bunch of other possibilities.



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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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8/12/13 12:35pm - Reply: 'Re: Engine rattle above 2000 rpm'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19458
Case75 said:...the engine made a quite a death rattle and a squeal and quit before I could reach the key. Unhappy


Ruh Roh....sounds like bad news to me....will the engine still crank over, or is it seized up? The description sure sounds like it seized up on ya....Cry

What does the oil smell like on the dipping stick?

Couple more kweschuns...
Did the engine shut off, or did the car just quit moving?
Will it start back up now?
A broken flywheel can make the same noises....and sometimes it might even still start the car.


|UPDATED|8/12/2013 10:35:04 AM (AZT)|/UPDATED|


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Joel Adams
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8/12/13 2:25pm - Reply: 'Re: Engine rattle above 2000 rpm'
Case75
Former Member
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
Adams' Apple said:
Case75 said:...the engine made a quite a death rattle and a squeal and quit before I could reach the key. Unhappy


Ruh Roh....sounds like bad news to me....will the engine still crank over, or is it seized up? The description sure sounds like it seized up on ya....Cry

What does the oil smell like on the dipping stick?

Couple more kweschuns...
Did the engine shut off, or did the car just quit moving?
Will it start back up now?
A broken flywheel can make the same noises....and sometimes it might even still start the car.




Well Joel, I haven't attempted to crank the engine. It quit on it's own while under power at about 40 mph with a knock and a squeal. Haven't pulled the dipstick either. Won't I hurt the starter motor if it is seized; I guess not if I just try it quick. New distributor arrived today from DUI and it's a beauty. At least I'll have it for the rebuild or replacement.



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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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8/12/13 4:08pm - Reply: 'Re: Engine rattle above 2000 rpm'
Case75
Former Member
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
Some good news. Just tried and the engine will turn over so it's not seized. It won't start though.

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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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8/12/13 4:28pm - Reply: 'Re: Engine rattle above 2000 rpm'
danascar
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Germansville, PA - USA

Vette(s):
1974 Coupe 358ci 4 speed Black w/Medium Saddle interior w/79 custom leather seats. 1999 Covertible, 6 speed, Atomic orange, Oak interior

Joined: 1/28/2010
Posts: 763
Well if is the timing chain/gear that went  you've just bent pushrods and maybe some valves stems. Happened to me. Same thing, just shut down while driving and wouldn't start. If you still have the stock plastic cam gear that isd what usually breaks. Cry

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8/25/13 9:18pm - Reply: 'Re: Engine rattle above 2000 rpm'
Case75
Former Member
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
danascar said: Well if is the timing chain/gear that went  you've just bent pushrods and maybe some valves stems. Happened to me. Same thing, just shut down while driving and wouldn't start. If you still have the stock plastic cam gear that isd what usually breaks. Cry

Well, I finally got around to pulling the valve covers and spark plugs. No top end damage that I can see and all 8 plugs look good; some carbon build up in cylinders 1 and 2 but no signs of detonation damage in the plugs, no oil fouling on them either. That's all the time I've had to look at things though.



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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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8/26/13 1:12pm - Reply: 'Re: Engine rattle above 2000 rpm'
F4Gary Gold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.

Joined: 8/26/2006
Posts: 870
Not too sound too dumb, but does it have enough oil in it?

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8/26/13 7:23pm - Reply: 'Re: Engine rattle above 2000 rpm'
Case75
Former Member
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
F4Gary said: Not too sound too dumb, but does it have enough oil in it?


Right to the top of the mark on the dipstick.


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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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8/26/13 10:06pm - Reply: 'Re: Engine rattle above 2000 rpm'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19458
Greg, have you tried cranking it with the plugs out?
Does the distributor rotor turn when you crank it over?
Does the engine oil smell "funky", or like it is burnt?
Do you have access to a bore scope?
It's possible that one(or more) of the wrist pins has worked loose from a rod, and is scraping on a cylinder wall. Not a good thing, for sure.

I'm thinking hard about what you said about the distributor moving, even tho it is tightened down as tight as the clamp will go. Imma wondering if the dadgum distributor itself hasn't taken a dump. Not the electrical part, but an actual mechanical failure...like the gear melting, or the pin on the gear shearing off...or the teeth themselves wearing off.
IF the dist. shaft itself was really tight down in the hole, it could mash the gear up against the oil pump too tight, and also against the boss in the block.

I'm REALLY hoping this isn't a major engine failure. Normally, if a rod, or crank bearing has taken a doo-doo(hi-teck terminology), the oil will smell bad. It also usually will cause the engine coolant temp to go high.
A rod pin coming out will scrape against the cylinder wall, also normally causing a higher than normal coolant temp, and lottsa metal in the oil.

A jumped timing chain will not normally damage any of the valve train parts, unless you have domed pistons, or a really high-lift cam...or rockers that are adjusted way too tight.

I'd really start checking the distributor....see if the rotor will turn with the engine, and that you cannot turn it(the rotor) by hand....

Fingers crossed....


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Joel Adams
C3VR Lifetime Member #56    
My Link


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             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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8/27/13 7:13pm - Reply: 'Re: Engine rattle above 2000 rpm'
Case75
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
Adams' Apple said: Greg, have you tried cranking it with the plugs out?
Does the distributor rotor turn when you crank it over?
Does the engine oil smell "funky", or like it is burnt?
Do you have access to a bore scope?
It's possible that one(or more) of the wrist pins has worked loose from a rod, and is scraping on a cylinder wall. Not a good thing, for sure.

I'm thinking hard about what you said about the distributor moving, even tho it is tightened down as tight as the clamp will go. Imma wondering if the dadgum distributor itself hasn't taken a dump. Not the electrical part, but an actual mechanical failure...like the gear melting, or the pin on the gear shearing off...or the teeth themselves wearing off.
IF the dist. shaft itself was really tight down in the hole, it could mash the gear up against the oil pump too tight, and also against the boss in the block.

I'm REALLY hoping this isn't a major engine failure. Normally, if a rod, or crank bearing has taken a doo-doo(hi-teck terminology), the oil will smell bad. It also usually will cause the engine coolant temp to go high.
A rod pin coming out will scrape against the cylinder wall, also normally causing a higher than normal coolant temp, and lottsa metal in the oil.

A jumped timing chain will not normally damage any of the valve train parts, unless you have domed pistons, or a really high-lift cam...or rockers that are adjusted way too tight.

I'd really start checking the distributor....see if the rotor will turn with the engine, and that you cannot turn it(the rotor) by hand....

Fingers crossed....

Thanks for the pointers Joel. I haven't turned it over since I bumped the starter a few times to see if it was seized or not. The oil smells OK to me. The temperature never exceeded 190 before this happened. The oil pressure was down but not way down. I don't know anyone with a bore scope. I've got some more work to do with my renovations before I really get into the engine. Soon I hope.



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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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8/28/13 7:18am - Reply: 'Re: Engine rattle above 2000 rpm'
knotacare
Former Member
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Newark, DE - USA

Vette(s):
1968 Conv, 454HO,500HP-600TQ, TKO-600,3:70 HD rear,hotrod air, custom paint & suspension,1973 Ruby Red,T-top, 383 Stroker, TK)-500,frame off restro, 1977 Yellow (1 of 51 ) L-48 4 spd, 99% original.

Joined: 7/26/2004
Posts: 453
Check for a cracked crank pulley. I had this happen on one of my vettes. You'll can feel for cracks by putting your hand down there & going around the pulley with your fingers. It will make a noise at a higher RPM's & gradually over time more noise at lower RPM's.
Alan


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10/12/13 7:01pm - Reply: 'Re: Engine rattle above 2000 rpm'
Case75
Former Member
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
Update:
 
I picked up a 383 stroker the other night from a friend of mine. It's a low mileage engine with aluminum heads and a mild cam. It's a 2 piece seal block from the 70's. I heard it running on a test stand. Good oil pressure and stabile vacuum. It'll get me back on the road for a low price with a bit more oomph. Smile


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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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10/13/13 10:33am - Reply: 'Re: Engine rattle above 2000 rpm'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19458
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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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10/13/13 9:25pm - Reply: 'Re: Engine rattle above 2000 rpm'
rod7515 Lifetime Member
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Red Lion, PA - USA

Vette(s):
1974 White 350 Corvette, TH400 Automatic 1972 Tangerine /Go Mango Convertible 383 Stroker, 2004r Automatic

Joined: 10/27/2006
Posts: 1172
Your gonna enjoy the torgue of a stroker motor! Nice choice. Best of luck. Rodney

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10/13/13 10:17pm - Reply: 'Re: Engine rattle above 2000 rpm'
Case75
Former Member
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
Thanks guys! This will be a good winter project. Look forward to getting her back on the road by spring. The only reason the engine was sold is the car it was in had an interior fire which resulted in an insurance right off. Car had only be on the road this year. Engine was not damaged in the fire and I had it checked out by a local engine builder who gave it the green light.

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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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12/11/13 3:32pm - Reply: 'Re: Engine rattle above 2000 rpm'
Case75
Former Member
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, - Canada

Vette(s):
1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.

Joined: 6/19/2012
Posts: 230
I got a call today from the gentleman that bought my old engine. It was rod knock I was hearing. The #8 rod spun the bearing and their were filings in the #7 journal as well. The front cam bearing was wore down to the copper and what stopped the engine was the nylon cam gear broke and stopped it dead in it's tracks. Only 76,000 miles on it.

|UPDATED|12/11/2013 1:32:58 PM (AZT)|/UPDATED|


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Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ
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12/12/13 1:03pm - Reply: 'Re: Engine rattle above 2000 rpm'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19458
 Ouch Ouch! Bummer. Well...that's someone else's problem now tho, right? LOL

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Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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