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10-23-2018, 10:04 AM | #1 |
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FlywhIeel housing
I have a flywheel housing that is way out of tolerance. I measured from the crank shaft flange around the housing and the measurements were over 30 thousands off. I found that the .010 shims were not behind the ears where the gas mechanism bolts on to there back of the block. I then placed the .010 shims in place which improved the situation but it is still out of specification.
Question 1. Can I put two .010 shims behind those ears instead of just the one? 2. Behind the four mounting bolts, can I put .005 to.010 shims as needed in addition to the doubled up .010 shims behind the two ears? I don't want to put to much strain on the housing but still have the runout measure within .005". Any thoughts or suggestions appreciated. Jack |
10-23-2018, 10:30 AM | #2 |
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Re: FlywhIeel housing
Jack, it sounds like the housing needs to be machined.
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10-23-2018, 10:53 AM | #3 |
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Re: FlywhIeel housing
I don't like using extra shims. So I have filed the covers to get them as close as I can. [ One from .034" down to .008"]
Brent is right, the 'more better' way would be to send it out for machining. |
10-23-2018, 12:36 PM | #4 |
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Re: FlywhIeel housing
Thanks to both Brent and Patrick. It may not be what I wanted to hear but good advice. Jack
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10-23-2018, 03:32 PM | #5 |
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Re: FlywhIeel housing
Try varying the amount of shim you place under the gas mech. ears and tighten the bolts through these ears before each alignment check. More or less from the base amount of .010" under these ears will usually bring all but the worst flywheel housings to within .006" (at 9:00, Noon and 3:00). Disregard your reading at 6:00 as the bellhousing will typically move this area as required.
If not, then machine it as Brent says. Good Day! Last edited by Dave in MN; 10-24-2018 at 07:29 AM. |
10-23-2018, 03:38 PM | #6 |
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Re: FlywhIeel housing
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10-23-2018, 03:41 PM | #7 |
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Re: FlywhIeel housing
Good to hear, Thanks Dave. I filed some and gained .002". Tomorrow will tell the results as I shim and measure . Jack
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10-23-2018, 03:43 PM | #8 |
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Re: FlywhIeel housing
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10-23-2018, 08:57 PM | #9 |
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Re: FlywhIeel housing
keep In mind the thickness of the gasket. the original gasket are very thin, and some reproduction gaskets are thicker. it makes a big difference on how many shims you have to add to make up for the thicker gasket.
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10-24-2018, 10:33 PM | #10 |
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Re: FlywhIeel housing
Surfacing a flywheel housing does little good, The repro ones are surfaced, and from what I found are off greater then any original. I have never had to give up on any housing, and say it cant be done. It is very easy.
First, you have to have a crank flange that is ground true to the center line of the crank, and make sure the flange rear, is 90 degree to the main, and is 100% Flat. There are only two adjustments. 9 and 3, and 12, and 6. Do 9 and 3 always first. I like the thick gaskets best, and won't go into to it now. The top two ears, when done, will have two different amounts of shims in them. The only thing that .010 thousandths shims are good for, is filling a large gap. My final adjustments are always down to .001 thousandths. Get your 9 & 3 to Plus, or minus, with in 3, or 4 thousandths. I will show some of Daves pictures. Next, you are ready for the 12, and 6 position. It does not matter what the sides are, compared to the top and bottom. What you are after is FOUR SQUARE POINTS to bolt the Bell housing to, so the pilot shaft, clutch, ect., run true. When adding, and subtracting shims now, you have to use equal amounts, in shim thickness. So bring the top, normally out to match what the bottom is, and your done. Herm. |
10-25-2018, 09:52 AM | #11 |
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Re: FlywhIeel housing
Herm; Why do your notes say "leave 24 hours"?
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10-25-2018, 11:21 AM | #12 |
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Re: FlywhIeel housing
I noticed that it looks like you paint the machined face of the flywheel or at least it looks green? Also on the block it looks like the intake and exhaust port surfaces are painted.I guess this is what I have been wondering to paint or paint around the gasket area.
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10-25-2018, 11:29 AM | #13 |
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Re: FlywhIeel housing
We leave the cast iron housing 24 hours, as they can, and do sometimes warp, and then you have to readjust the shims, and in that case we leave another 24 hours. Getting that housing square, is very important to wear, and vibration.
Herm. |
10-25-2018, 11:31 AM | #14 | |
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Re: FlywhIeel housing
Quote:
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10-25-2018, 11:47 AM | #15 | |
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Re: FlywhIeel housing
Quote:
Herm. |
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10-25-2018, 01:32 PM | #16 |
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Re: FlywhIeel housing
I have never heard that before.Theoretically I think two mating surfaces in a perfect world would depend less on a gasket not more to seal.
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10-25-2018, 01:45 PM | #17 |
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Re: FlywhIeel housing
Just thought I would mention it, if more experienced Barner's don't agree, definitely believe them. Since Kohnke paints, it must be OK. Wanted to see if my understanding is right or wrong or doesn't matter.
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10-25-2018, 02:14 PM | #18 | |
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Re: FlywhIeel housing
Quote:
I think this applies mostly to the head gasket, see the link. https://www.felpro.com/technical/tec...ce-finish.html Bob |
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10-25-2018, 02:25 PM | #19 | |
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Re: FlywhIeel housing
Quote:
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10-25-2018, 05:07 PM | #20 | |
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Re: FlywhIeel housing
Quote:
Herm. |
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