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#835319 - Thu Mar 15 2012 12:29 AM New Engine Problem, Need Advise  
Tiny  Offline
Joined: Aug 2005
Posts: 10,849
South Central Kansas
Some of you know I had the engine in my '38 rebuilt. I had the rods machined for insert bearings and ended up .010 on the rod and main bearings. I reused the cam, lifters and rocker assemblies because they had little wear. I used an NOS oil pump. Before the first start we turned over the engine using the starter without spark plugs to verify oil to the top end and to fill the dipper troughs prior to starting the engine. I didn't hear it when we started and ran the engine the first time but after all of the sheetmetal is back on and everything connected there's a squeaking in the bottom of the engine. It sounds almost exactly like a chirping/squeaking fan belt that squeaks rhythmically - squeak, squeak, squeak. The faster the engine speed the quieter the noise and conversely the slower the engine speed the louder the noise. The frequency of the squeaking varies with the speed of the engine, getting faster as the engine speeds up. Driving at 30 MPH there is no noise but at idle it's noticeable 30 feet away. We looked extensively for the source of the noise. We even disconnected the fan belt to rule that out as the culprit. Sometimes it sounded like it's coming from the front of the engine, sometimes the back. To me, as a once-upon-a-time body man from long ago it sounds similar to two pieces of raw sheetmetal rubbing together and rhythmically squeaking. We call it the 'bird' because it's kind of a chirping squeak. We finally found the 'bird's' home but have yet to find the 'bird'. When we remove the road draft cap the sound gets much louder, the noise is inside the oil pan area. I've never heard a bad bearing but those who have tell me it sounds nothing like a scarred bearing. I drove the car to the engine builder's shop for him to listen to it and he's baffled. He says he's never heard the like. When I get it fired up again I'm going to record the sound and post it for you all to listen to. I'm looking for ideas of what to check and what it could be. Oh, yes the oil pressure starts and stays at about 15 PSI so it should be getting oil everywhere it needs it. Ideas????


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#835372 - Thu Mar 15 2012 03:10 AM Re: New Engine Problem, Need Advise [Re: Tiny]  
truckernix  Offline
Joined: Mar 2002
Posts: 8,821
Bracebridge Ontario Canada
I think there have been previous posts about a squeaking that occurs when a rod isn't getting enough oil. Something like a dipper trough with a hole or a badly aimed sprayer could be responsible.


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#835375 - Thu Mar 15 2012 03:19 AM Re: New Engine Problem, Need Advise [Re: truckernix]  
Mr. Lang  Offline
Shop Shark
Joined: Jun 2008
Posts: 1,507
Brentwood Bay, BC Canada
What Fred said, also, could a trough be so far out of alignment that the rod strikes it?


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#835381 - Thu Mar 15 2012 03:27 AM Re: New Engine Problem, Need Advise [Re: Mr. Lang]  
Pre '68 Dave  Offline
Shop Shark
Joined: Jan 2001
Posts: 4,698
Snohomish,WA,USA
How about a bad fuel pump?
Have you tried it with the clutch in and out?


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#835449 - Thu Mar 15 2012 01:18 PM Re: New Engine Problem, Need Advise [Re: Pre '68 Dave]  
rickmg  Offline
Shop Shark
Joined: Feb 2011
Posts: 387
michigan
My 39 had a squeak. It was the clutch throwout bearing. What about the pilot bearing?


#835456 - Thu Mar 15 2012 01:41 PM Re: New Engine Problem, Need Advise [Re: rickmg]  
Yakimabowtie  Offline
Shop Shark
Joined: Feb 2006
Posts: 750
Yakima, Wa.
Another item prone to squeaking is the pilot bushing.


#835471 - Thu Mar 15 2012 02:44 PM Re: New Engine Problem, Need Advise [Re: Yakimabowtie]  
Tiny  Offline
Joined: Aug 2005
Posts: 10,849
South Central Kansas
We replaced the pilot bearing. I would think a bushing or bearing would be a steady noise rather than rhythmic wouldn't it? One thing I didn't mention but should have is it can't be something that would hit/rub/strike on every revolution because the timing of the noise is the same as a noisy lifter. It doesn't chirp 500 times a minute. I've got to reset the valve lash and the chirp is almost in time to the noisy lifters. Seems like it might be in time with the cam. I don't believe anything was done with the troughs or squirters. To the best of my knowledge the pan was only removed and then reinstalled with a new gasket. I'll double check with the builder today about what if anything he did with that. I suppose it's possible he put on of the dippers on backward?? I'll pass the ideas along. I sure don't want to crawl my well fed self under there and pull that pan.


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The three main causes of blindness: Cataracts, Politics, Religion.

#835478 - Thu Mar 15 2012 03:07 PM Re: New Engine Problem, Need Advise [Re: Tiny]  
Hotrod Lincoln  Offline
Extreme Gabster
Joined: Feb 2004
Posts: 14,635
Dellrose, TN
If the squeak is a dry bearing, pulling the pan now might save it. Running it until you get a knock almost guarantees a ruined crankshaft as well as a bad bearing. I've also heard of the crankshaft hitting the pickup tube to the oil pump. The clearance there is VERY close. If the noise is at the same frequency as the valve operation, try removing the fuel pump and running the engine on the gas left in the carburetor or a gravity-feed can. Block the pump hole off with something or you'll get a massive oil leak.
Jerry


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#835490 - Thu Mar 15 2012 04:33 PM Re: New Engine Problem, Need Advise [Re: Hotrod Lincoln]  
truckernix  Offline
Joined: Mar 2002
Posts: 8,821
Bracebridge Ontario Canada
Tiny,
was anything done with the oil distributor valve?

Fred


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


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#835492 - Thu Mar 15 2012 04:35 PM Re: New Engine Problem, Need Advise [Re: Hotrod Lincoln]  
CASO  Offline
Shop Shark
Joined: Jun 2011
Posts: 2,004
Warrenton, Oregon
Take off the pan. Set up video cam on tripod and. Begin recording. Start engine. Run just long enough to aquire a few squeaks and shut engine off. Watch video on slow mo and see what is where when squeaks happens.


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