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Engine rattle
#1
I have a rattle in my 351C, I almost know what it is but just need to hear it from someone, I reckon. Runs great, oil light goes right off and doesn't blink at idle, but about the time you shift gears...no high rpm's.. it starts rattling.. like it has marbles in there somewhere. I pulled the pan before it went in and the bearings looked good. I know, I should have gauged them...but I didn't. Could it be carbon on top of a piston? other thoughts ? Not a deep knock like a main, just a rattle.
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#2
don29163;40310 Wrote:I have a rattle in my 351C, I almost know what it is but just need to hear it from someone, I reckon. Runs great, oil light goes right off and doesn't blink at idle, but about the time you shift gears...no high rpm's.. it starts rattling.. like it has marbles in there somewhere. I pulled the pan before it went in and the bearings looked good. I know, I should have gauged them...but I didn't. Could it be carbon on top of a piston? other thoughts ? Not a deep knock like a main, just a rattle.

Does it rattle idling or if you rev up in park?? could be several things depending on when it happens, if it mainly happens after deceleration i would say mains or rods and a possible stretched timing chain. Just a couple of guesses

[Image: 2zdx09d.png]
Yea,Tho i cruise through the valley of the shadow of rice,I will fear no Turbo,For Torque art with me.Thy rods and crankshaft,they comfort me. Big Grin Robert
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#3
I had a rattle in my 351c last year. I found that the bolts for the stall had hogged out the bolt holes in the flex plate. It was noticiable as soon as I started the car at idle. Just an idea.
Jim

drive it like you stole it
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#4
does it on acceleration. It is a 4 speed
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#5
don29163;40314 Wrote:does it on acceleration. It is a 4 speed but about the time you shift gears...

Possible throw out bearing?? also on acceleration it could be pre ignition.

[Image: 2zdx09d.png]
Yea,Tho i cruise through the valley of the shadow of rice,I will fear no Turbo,For Torque art with me.Thy rods and crankshaft,they comfort me. Big Grin Robert
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#6
thundertc64;40315 Wrote:
don29163;40314 Wrote:does it on acceleration. It is a 4 speed but about the time you shift gears...

Possible throw out bearing?? also on acceleration it could be pre ignition.

X2 on detonation. Mine did the same thing and I found the cam advanced 11* when we degreed the cam. My rod bearings were hurt on the rod side, no damage on the cap side. Pulling caps do not give the whole story.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
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#7
Are you running roller rockers?
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#8
Try taking a few degrees of advance out to see if it changes. Last tank of gas from a different station??? Just taking shots in the dark. Chuck
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#9
Sounds like pre ignition to me.

If you have gotten gas from a different station and it was not exhibiting the problem previously, I would say it is definitely pre ignition.

BT

Do the RIGHT thing.
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#10
Thanks, I'll try the timing and see if that helps any.
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