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William Cullen
United Kingdom
229 Posts |
 Posted - 22/07/2009 : 16:31:10
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Hi all
I was speaking to a Canadian friend reference my fitting a solid copper headgasket to my PA and he has told me about a coulpe of products used overthere by hot rod builders using solid copper h/gasket they are :GWG P/5 Gasket dressing & Permatex 80697 copper spray this is a high temp sealant for copper gaskets any one used these products to seal a triple M soilid copper gasket ? and are these better than Wellseal?
Thanks
Bill |
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phil
United Kingdom
149 Posts |
Posted - 22/07/2009 : 23:19:01
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| hi, i can vouch for welseal, wonderfull stuff. |
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etlanpa
United Kingdom
560 Posts |
Posted - 23/07/2009 : 09:32:20
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Yes, Wellseal is the business (been around for years!).
Apply thin coat to all four surfaces & let it go tacky before assembly. The gasket will require annealing first of course... |
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Bruce Sutherland
United Kingdom
1580 Posts |
Posted - 23/07/2009 : 14:29:44
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Please forgive my lack of first-hand experience here as I've yet to get to this stage in my rebuild, but if a sticky gasket sealing 'goo' is used won't this make alignment of the cylinder head to get the vertical drive components properly lined-up difficult?
Not withstanding the 2 waisted cylinder head studs which help to act as dowel locators, I believe there is still a requirement to carefully align the position of the head to get the camshaft pinion drive fork to mate co-axially with the dynamo output coupling?
Please will someone clarify this?
Bruce. (PB0564) |
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talbot
United Kingdom
718 Posts |
Posted - 23/07/2009 : 17:06:25
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Bruce,
As I understand the important thing is to ensure the dymnamo shaft is exactly concentric to the shaft of the cam bevel gear. A slightly thicker gasket will move the drive forks away from each other but it will not affect the aligment of the shafts. Shallow forks are available to accommodate skimmed heads. The aligment of the shafts is adjusted by either rotating the lower bevel gear box (may need the dowel to be moved !!!!)or selecting a shim pack between the block and bevel box. Not an easy job but an essential one. I know a J2 that has double spring washers on the dynamo securing bolts that are finger tight. You can see the casing move as the engine runs - that is after you have wiped the oil away. It has been like this though for the last 20 years.
Cheers
Jan T |
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Bruce Sutherland
United Kingdom
1580 Posts |
Posted - 23/07/2009 : 22:27:26
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Thanks Jan, so the cylinder head location on the block is 'fixed' via the two waisted/dowel studs and concenticity alignment for the vertical drive dynamo shaft and the camshaft bevel gear drive shaft is via adjustment of the crankshaft bottom bevel gear housing to the block...........hmmmmmm.
Bruce. (PB0564) |
Edited by - Bruce Sutherland on 23/07/2009 22:30:40 |
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kimber
United Kingdom
1529 Posts |
Posted - 24/07/2009 : 07:03:13
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| Everything thing is 'fixed'. That is the problem. It is easier to find any necessary adjustment by repositioning the front housing as described above. Once the correct alignment has been re-established, then the relative positioning can be 'fixed' again and (theoretically) should never alter. |
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talbot
United Kingdom
718 Posts |
Posted - 24/07/2009 : 10:41:59
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Bruce,
I tried to test for concentricity with a DTI fixed to the dynamo fork and the plunger running round the bore in the cylinder head. Unfortunately my dial indicator is too large and I just couldn't get it to work. I then made up a mandrel that was a close fit in the pinion bearing and turned a point on one end. I could then test for alignment using the centre countersink on the dynamo shaft. I believe this a standard method.
Cheers
Jan T
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Bruce Sutherland
United Kingdom
1580 Posts |
Posted - 24/07/2009 : 11:50:22
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Jan, thanks for the method for achieving concentricity in the vertical drive.
Andrew, thanks for a superb engine re-build article in the 2008 Yearbook - a new reference document for all of us.
Bruce. (PB0564) |
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kimber
United Kingdom
1529 Posts |
Posted - 24/07/2009 : 19:14:32
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quote:
Originally posted by Bruce Sutherland
Jan, thanks for the method for achieving concentricity in the vertical drive.
Andrew, thanks for a superb engine re-build article in the 2008 Yearbook - a new reference document for all of us.
Bruce. (PB0564)
Very kind of you to say so. Appreciated. |
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Gordon
United Kingdom
693 Posts |
Posted - 25/07/2009 : 10:34:05
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You have to start from first principles! Ensure that the top of the block is parralel with the bore of the main bearings and that the front face of the block is square to this. Now you can follow the instructions re centering dynamo drive line!
Gordon |
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Bruce Sutherland
United Kingdom
1580 Posts |
Posted - 27/07/2009 : 11:08:31
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Many thanks to all for clarifying the exacting requirements for aligning the vertical drive components, and my apologies to Bill for hi-jacking his original query.
So, itĘs Wellseal or an equivalent to be applied to both sides of an annealed copper cylinder-head gasket and also to each mating face on the block and head then?
Bruce. (PB0564) |
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