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Silent shaft gear came off, but engine still ran for many miles! #1011512 10/23/10 01:47 AM
Joined: Jun 2010
Posts: 38
rollguy Offline OP
Getting the Wheeling Fever
I changed the timing belts about 3,000 miles ago, and since then the engine had a vibration at about 3,200 RPM. My truck also developed a large oil leak the past few weeks and I decided to find out why today. I thought I might find the problem with the vibration as well. I went to the self serve car wash, and cleaned the engine. When I got home I noticed oil leaking from what appeared to be the front crankshaft seal. A trip to NAPA and a seal was purchased. A few weeks ago I noticed a sound like a belt slipping or a bearing going bad. A few days ago the sound went away. I now know why the sound went away and the reason for the vibration and oil leak. I pulled the top cover, and much to my surprise I found this:
[Linked Image]

It seems that the reason for the oil leak is because the upper silent shaft gear had come loose. It was just sitting there, bolt and all. The gear spacer is the sealing surface and it had moved forward causing the leak. I think that it is a miracle from God that the bolt or gear did not get wadded up between the belt and another gear. When I removed the lower cover the gear and bolt fell out. Upon inspection I found that the flat spot on the gear was worn off and the gear was just slipping on the shaft (the reason for the noise and vibration). After a while, it must have loosened the bolt and fell off.
[Linked Image]
Left gear is an extra one I had from another engine, Right is the rounded out one (notice the flat gone).
The incredible part is that the gear was the only damaged part. The belt, silent shaft, spacer, bolt and washer were all fine. I put the parts back on and the engine runs smooth and quiet now! It could have been a disaster if any one of those parts fell down any further. I thank God it was an easy repair and cost only my time. I returned the seal to NAPA, as it would have been a big job to replace it (found that it was not leaking).

Re: Silent shaft gear came off, but engine still ran for many miles! [Re: rollguy] #1011513 10/26/10 04:54 AM
Joined: Jul 2006
Posts: 50
Jonno Offline
Getting the Wheeling Fever
that's awesome, ! can't believe it just sat there.

Re: Silent shaft gear came off, but engine still ran for many miles! [Re: Jonno] #1011514 10/26/10 10:29 PM
Joined: Jan 2005
Posts: 1,538
torquemonster Offline
Body Damage is Cool
Reminds me of snapping my balance shaft belt 2 years ago. Spit the balance belt out the top of the timing cover where the cam gear is, somehow didn't break the timing belt even though it chewed up the balance belt a couple times on its way out....high five to horseshoes up our <img src="/forums/images/graemlins/butwiggle.gif" alt="" />

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