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11-14-2019, 01:32 PM | #1 |
Junior Member
Join Date: Jan 2018
Location: 10 miles far from lake constance
Posts: 23
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O-ring groove in flywheel housing
I tried to align the flywheel housing with the crank. Without
papergasket it`s easy to proceed the job, set from BILL BARLOW. Shimming here, shimming there, after 30 min. the job is done. Instead of using now the thick paper gasket I apply a string of silicone sealant the whole length of the sealing surface, place correct O - ring in the groove milled in the flywheel housing opposite the rear cam bearing, six screws are properly tightened to the correct torque. So the rear cam bearing is impossible to start leaking. Received the housing today and yes ---- I am happy Someone already knows this improvement ??????? |
11-14-2019, 01:56 PM | #2 | |
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,516
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Re: O-ring groove in flywheel housing
Quote:
What 6 screws? A Model-A engine block only has 4. Did you machine the cylinder case for two additional bolts? Also, even in a pressurized scenario (-which the Model-A block is not) the paper gasket does not leak. The bigger issue is the flywheel housing will warp over time. In my opinion, all that really needs to be machined is the entire housing surface, and not a counterbore for an O-ring.. |
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11-14-2019, 02:06 PM | #3 |
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Join Date: May 2010
Location: So Cal
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Re: O-ring groove in flywheel housing
He's probably counting the dowel pin holes.
Bob |
11-14-2019, 02:51 PM | #4 |
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Location: Eastern Tennessee
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Re: O-ring groove in flywheel housing
Ok I am confused, how do you torque dowel pins??
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11-14-2019, 02:59 PM | #5 |
Junior Member
Join Date: Jan 2018
Location: 10 miles far from lake constance
Posts: 23
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Re: O-ring groove in flywheel housing
my problem is the engine block which warp at the four lower threads for the bolts. The flywheel housing, which is not original from this car, is very straight. I never thought that this can happen. So the block was processed (honing, modern crank bearing shells, new rods) but without make even the rear flywheel housing flange. Here in germany is not much experience around, regarding As and also with my training as a car mechanic -- I can not know everything.
I will not take the block on the milling machine again. So I thought for a solution and this was the way. @ BRENT in 10-uh-C -- please note attached image, the holes for the six bolts are numbered. The dowel pins are not possible to tighten with a torque wrench. Also in my opinion the paper gasket is the cause of warpy housings. |
11-14-2019, 03:52 PM | #6 | ||
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Location: Eastern Tennessee
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Re: O-ring groove in flywheel housing
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11-14-2019, 04:30 PM | #7 |
Junior Member
Join Date: Jan 2018
Location: 10 miles far from lake constance
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Re: O-ring groove in flywheel housing
the rear engine flange I checked with a straight edge, same as the housing flange. For me now, faced with the problem, the cause is already clear.
When I started to revice my baquet, I invited 3 - 4 Ford A owner, because i wanted to know their experience. I wanted to suck their brain. But more than a oil change or a brake lining swap they had never done. Many problems and solutions I get from the service bulletins -- like the additional oil hole for the rear cam bearing. But to become the experience of 30 years Ford A in one year is not possible. I limp off with a few things afterwards. But if I find a cheap solution like the O-ring groove for a big problem like the warpy engine block, I am very happy. I am with you ragarding the force which cause the warpy housings. But in my opinion it`s also the tension near the thread and bolts. Near there the papergasket is getting thinner and thinner. Between the bolts the papergasket gives more force against. So the housing is getting more wavy. It`s the same as with the top water outlet. Why is it recommended to put a match on the outside? Because the papergasket near the bolt become very thinn and the neck of the outlet flange gets space to bend. |
11-14-2019, 04:44 PM | #8 |
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Join Date: May 2010
Location: Southern California
Posts: 3,131
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Re: O-ring groove in flywheel housing
My experience has been that it is important that all six mounting bolts be torqued down evenly with the two .010 shims installed under the top two mounting bolts in order to get a proper measurement. In order to do this you need to obtain two shorter bolts for the mounting bolts at the ears because you would not normally have the throttle linkage bolted up.
The .010 shims are there to compensate for the gasket thickness used at the lower four mounting bolts. The problem is all the suppliers provide gaskets that are much thinner than the shims. For this reason I obtain gasket material from an auto supplier that is about .015 thick and cut my own gaskets. The .015 gasket will crush down to about .010. Tom Endy |
11-15-2019, 03:40 PM | #9 |
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Location: Wa.
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Re: O-ring groove in flywheel housing
There is a FAR easier solution to sealing the rear cam journal. It involves NO machining to the block OR bell housing.
Shorten the rear journal on the cam by .300. Make a cup plug to go in the block. |
11-16-2019, 03:07 AM | #10 |
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Join Date: Jan 2018
Location: 10 miles far from lake constance
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Re: O-ring groove in flywheel housing
Yes, I already read about the cover in the rear camshaft bearing. It`s a swiss one which had done this modification. Here the link: https://www.maurer-markus.ch/ford_a/...deckel.en.html
Only I have to disassemble the engine to cut the cam. The groove for the O- Ring was a 20 min job with the CNC milling cutter |
11-16-2019, 03:23 PM | #11 | |
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Re: O-ring groove in flywheel housing
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