Engine guys
#472973
09/19/09 11:11 PM
09/19/09 11:11 PM
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Joined: Nov 2003
Posts: 4,027 Dearborn Hts, MI
Sledge_57
OP
master
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OP
master
Joined: Nov 2003
Posts: 4,027
Dearborn Hts, MI
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I have this noise/rattle I can't find. I'm beginning to fear it's piston slap. Can some one give me a good way, without pulling the motor, to diagnose this? It kind of sounds like detonation but it isn't, I hardly ever hear it when the motor is under a load. If I put the trans in 3rd and hold the brakes hard to really load the engine (manual VB) it doesn't make the sound. You'll hear it while cruising easy, sometimes on decel and occasionally at idle. Another way to describe the sound is it sounds like a bolt rattling around in the exhaust pipe or like a loose bolt where the collector adapters bolt to the headers (would be nice but that's not it either).
Doug
1967 "Pedal Car" 500" low deck , TF 727, 4.30 Locker Best to Date: 11.67 @ 114.9 1.64 60ft
"Kids in cars cause accidents. Accidents in cars cause kids..."
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Re: Engine guys
[Re: Sledge_57]
#472974
09/19/09 11:16 PM
09/19/09 11:16 PM
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Joined: Mar 2007
Posts: 12,008 Finally a HUSKER again
Moparnut426
I Live Here
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I Live Here
Joined: Mar 2007
Posts: 12,008
Finally a HUSKER again
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Here is a thought,,, Can you make it do it consistantly? If so, grab a insulated plyers, and individually remove plug wires as its idle/running, this might pin point the cylinder/cylinders with the issue. I have heard worn rocker arms make a similar noise. Do you run the good ol trusty stamped steel OEM rocker arm? I had a 318 that would rattle at idle, and sometimes under load if you knew how to do it. You can take an old valve cover, cut the top off, install it so you dont get oil everywhere, and put slight preasure on each rocker with your thumb. AT IDLE ONLY!!!, and you might be able to make the noise go away. Kasey
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Re: Engine guys
[Re: dthemi]
#472976
09/20/09 12:45 AM
09/20/09 12:45 AM
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Joined: Nov 2003
Posts: 4,027 Dearborn Hts, MI
Sledge_57
OP
master
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OP
master
Joined: Nov 2003
Posts: 4,027
Dearborn Hts, MI
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Not converter bolts and no I can not make it do it consistently, this is part of the reason this has been such a pita to locate. The only time it seems to do it when idling is in the middle of traffic with a zillion cars around, never can make it happen in my driveway.
I drove it tonight and never heard it until I was almost home, after about 1/2 of driving.
Sometimes I'll hear it within a minute of leaving the house, no rhyme or reason as to when the sound appears.
As far as rockers, I have what ever rocker Indy sells for SR heads and a solid cam. it's not coming from the valvetrain, I can almost guarantee...
Doug
1967 "Pedal Car" 500" low deck , TF 727, 4.30 Locker Best to Date: 11.67 @ 114.9 1.64 60ft
"Kids in cars cause accidents. Accidents in cars cause kids..."
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Re: Engine guys
[Re: Bob_Coomer]
#472978
09/20/09 11:13 AM
09/20/09 11:13 AM
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Joined: Nov 2003
Posts: 4,027 Dearborn Hts, MI
Sledge_57
OP
master
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OP
master
Joined: Nov 2003
Posts: 4,027
Dearborn Hts, MI
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Well mine is a low deck stroker with 6.700 rods, I don't think these are considered short But like I said the noise will occur sometimes when the engine is cold and other times you won't hear it for a long time. Sometimes when you hear it, it only lasts a second or two and then it might be a while before you hear it again if at all, or it may rattle for a couple minutes on and off. It's never predictable, so I always figured it must be something other than the motor doing it, it sounds like something rattling on an exhaust pipe but I can find nothing touching or close to touching. This is the second summer I've been searching for it. I thought I'd found it when I discovered my damper was bad, replaced that at the beginning of the spring but that wasn't it obviously.
Doug
1967 "Pedal Car" 500" low deck , TF 727, 4.30 Locker Best to Date: 11.67 @ 114.9 1.64 60ft
"Kids in cars cause accidents. Accidents in cars cause kids..."
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Re: Engine guys
[Re: Sledge_57]
#472981
09/20/09 11:58 AM
09/20/09 11:58 AM
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Joined: Jan 2003
Posts: 1,072 The Sunny Shuswap
dodgefarmer
super stock
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super stock
Joined: Jan 2003
Posts: 1,072
The Sunny Shuswap
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Oh! them mods! To check end play in the car you just need to pry behind the flywheel and/or damper for any noticable motion. Seeing as how most engines are assembled with less than 0.008" end play if you can see any motion at all you have a thrust face problem. Randy
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