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01-17-2021, 07:04 AM | #21 |
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Join Date: Aug 2016
Location: West Virginia
Posts: 430
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Re: Help with an engine noise...
I bought a “pipe plug socket “ that actually fits the square head main bearings bolts.
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01-17-2021, 07:54 AM | #22 | |
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Join Date: Sep 2016
Location: Roanoke, VA USA
Posts: 1,908
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Re: Help with an engine noise...
Quote:
Hmmm... I didn’t know such a thing exists. Did you buy something like this? Sunex 2841 1/2-Inch Drive Pipe Plug Socket Set, Male/Female set, Cr-Mo, 7/16-Inch - 5/8-Inch Male, 7/16-Inch - 5/8-Inch Female, 8-Piece https://smile.amazon.com/dp/B002GT5V..._pndbGb4HXPYJB Sent from my iPhone using Tapatalk |
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01-17-2021, 08:53 PM | #23 |
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Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,897
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Re: Help with an engine noise...
Kawagumby, That is one nice looking car. Looks like the roadster I wish I still had.
My take on babbett engines is that the shims are there for a reason and that taking up the bearings is a normal maintenance task. I think that the bearings should be at least checked after about 3,000 miles after a rebuild, especially if they were hand fitted by scraping them in.
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
01-21-2021, 07:41 PM | #24 | |
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Join Date: Nov 2020
Location: Hollister, CA
Posts: 133
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Re: Help with an engine noise...
Quote:
Hi, I took some pictures that illustrate my approach to fixing the noisy rod. Number 4 rod was the culprit and was very loose, like .025 loose in places. However, I lucked out as the crank journal was still like new, and the rod babbitt surfaces were in good shape. I noticed the engine had been assembled with many shop-worn nuts and bolts, and sure-enough one of the rod nuts was beginning to strip, which may have compounded the problem, however, it seems to me that the original setup was too loose to begin with. Here's a picture of the cap...no4A.jpg I was concerned about uneven journal wear so I took plastigage readings at top and bottom, and with the crank positioned at each side. Here's some pictures... no4B.JPG no4c.jpg no4d.jpg no4e.jpg no4f.jpg no4g.jpg The crank journal is good from all directions. The clearances around the crankshaft are now between .001 to .0015 with one small spot area over that. Not bad. Finding nuts that afforded the correct torque that would line up with the cotter pin hole was a chore, and I had to do some lapping to get the right nut height for placing some of the cotter pins. I was fighting the shims all the way...some were stuck together and not usable...good thing I was mostly pulling shims. I also had ordered two sets of castle nuts, one from CWMoss, and one set from Mike's, unfortunately, the set from Mike's was unusable as the nuts were too short (below the cotter pin hole). Here's the kind of shim set Bratton's sent me: no4last.jpg You can tell a loose rod from the side play! I had two, number 3 was just a bit out of spec' but the side play was a giveaway. Ready for the model B pan gasket...should get it tomorrow. no4i.jpg Tom Last edited by kawagumby; 01-22-2021 at 11:50 AM. Reason: babbitt not babbit! |
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01-21-2021, 09:50 PM | #25 |
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Join Date: Dec 2019
Posts: 1,196
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Re: Help with an engine noise...
Thats a BB crankshaft with swedged on counterweights.
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01-21-2021, 10:29 PM | #26 |
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Join Date: Nov 2020
Location: Hollister, CA
Posts: 133
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Re: Help with an engine noise...
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01-22-2021, 10:42 AM | #27 |
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Join Date: Dec 2019
Posts: 1,196
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Re: Help with an engine noise...
The BB crankshaft was the heaviest crankshaft Ford offered, total rotating mass weight at 130 lbs. Rotating mass dampens vibration and stores kinetic energy, good for smooth operation. Racers don't like rotating mass.. the engine doest spool up as fast.. but driving the car is way smoother with weight, clutch function, hill climbing you name it.
Obviously you dodged this bullet, but grinding the crankshaft rod journals requires removal of the counterweights.. basically you walk away from the job. Those bratton shims are laminated..you need a good sharp razor blade to peel it. |
01-22-2021, 10:51 AM | #28 |
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Join Date: Nov 2020
Location: Hollister, CA
Posts: 133
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Re: Help with an engine noise...
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01-22-2021, 11:06 AM | #29 |
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Join Date: Dec 2019
Posts: 1,196
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Re: Help with an engine noise...
be careful with the fingers and give it a try.. they are stamp cut, it looks like solid brass.
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01-22-2021, 11:49 AM | #30 |
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Join Date: Nov 2020
Location: Hollister, CA
Posts: 133
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Re: Help with an engine noise...
Ok...I put one in a vise and twisted it...and guess what? You are right...Doh! The laminations made themselves known! I'll revise my earlier post so people don't think Bratton's sells an unusable product.
Tom |
01-22-2021, 12:04 PM | #31 |
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Re: Help with an engine noise...
Trying to peel .001 off can be fun.Original ones were steel,some feel the brass doest provide the support steel does.
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01-22-2021, 06:12 PM | #32 |
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Join Date: Mar 2012
Location: Ohio
Posts: 1,972
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Re: Help with an engine noise...
Looking at those bearing surfaces, I'd say now that you have taken them up you are good to go.
Placing the shim pack on a work bench, and using a single edge razor blade, or an exacto knife can work. |
01-29-2021, 04:14 PM | #33 |
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Join Date: Nov 2020
Location: Hollister, CA
Posts: 133
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Re: Help with an engine noise...
So I got it running today (nice break in the weather). It runs great. No more knock and I was able to fix a lot of minor things while I had everything apart. There is a bit more valve noise as I opened up the exhaust valve clearance from 15 to 18 thou' as this is a B engine. Best part is no oil or water leaks! I use Yamabond (my favorite gasket sealer from my dirt bike workings) and paid special attention to the rear cam area and main bolts. I also went with a neoprene front seal. Here's a couple of pic's: engtrial1.jpg engtrial2.jpg Tom |
01-30-2021, 10:56 AM | #34 |
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Join Date: Jun 2015
Location: Red Deer, Alberta
Posts: 5,046
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Re: Help with an engine noise...
If that's a copper fuel line, I'd replace it w/steel (for safety).
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01-30-2021, 02:44 PM | #35 |
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Join Date: Nov 2020
Location: Hollister, CA
Posts: 133
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Re: Help with an engine noise...
Yep. I'm planning on doing something different with the fuel line, including possibly inserting a second shut-off valve, as the primary shut-off valve has a very slow leak...so for long-term storage a second shut-off might be nice to have. |
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