kendo
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 posted on 29/10/10 at 11:46 AM |
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Rocker cover sealing help req'd
Help.
I cannot get my rocker cover to seal.
Its a crossflow engine and I can get a seal all the way around except between the bolts on the exhaust side.
I've even made up a stiffening plate to try to get it to clamp down more evenly.
I've used cork gaskets from Burton power and now one from a local motor factor which is cork but it looks rubbery and is stiffer than the burton
one.
I've used Blue hylomar. Is that were I'm going wrong?
Please help - I want to bring the car home from Bedfordshire but I'm not going to driver it with oil pouring out.
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r1_pete
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| posted on 29/10/10 at 11:58 AM |
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You may be tightening the screws too tight, which has resulted in the cover distorting.
Sit it on the head with no gasket, and press down at 20mm intervals around it, if it pops up on the opposite side / end, it is distorted and will need
careful truing up, or replacing.
Distortion is usually round the screw holes and can be successfully dressed back if you're careful.
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ashg
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| posted on 29/10/10 at 11:58 AM |
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you shouldn't put anything on a cork gasket. hylomar is for head gaskets
Anything With Tits or Wheels Will cost you MONEY!!
Haynes Roadster (Finished)
Exocet (Finished & Sold)
New Project (Started)
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steve m
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| posted on 29/10/10 at 12:04 PM |
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As said above it appears to be either overtightend/warped/ or somthing inside the rocker cover preventing the cover to bottom out
If you remove the gasket and place the cover in position does it appear to be a uniform gap all the way round ?
i have a spare standard cover if required for a coupleof beer tokens for postage ?
Steve
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steve m
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| posted on 29/10/10 at 12:08 PM |
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The other way is to use two gaskets with longer bolts, but that is a bodge, but may get you home ?
steve
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Alan M
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| posted on 29/10/10 at 12:23 PM |
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Are you sure the problem isn't caused by excess crankcase oil pressure? What sort of breather system have you got?
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David Jenkins
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| posted on 29/10/10 at 12:47 PM |
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Put a straight edge on the mating surface of the cover, over the holes. Chances are that the screws have been over-tightened and pulled into a dent.
This can be tapped out using a light hammer with a lump of metal behind, to flatten it out.
I've also heard of people using the washers from a Pinto rocker cover, which are a flattened-V shape, and hold the cover more securely.
Excess crankase pressure is not likely to be a problem - we're talking about a x-flow, and stopping them leaking at the sump and rocker cover is
a regular challenge!
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Alan M
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| posted on 29/10/10 at 12:54 PM |
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I run my crossflow on twin delortos and until I fitted a catch tank and drilled the filler cap it developed enough pressure to blow the dipstick out!
In 2 years my engine has not leaked a drop of oil, the secret is to make sure the surfaces are clean and true.
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kendo
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| posted on 29/10/10 at 01:39 PM |
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thanks chaps.
Checked cover, bolt holes dimpled and slightly twisted. cover now sits more naturally.
Trying no sealant and only hand tight.
engine is vented to catch tank and cap has a hole.
Here we go.
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pewe
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| posted on 29/10/10 at 02:18 PM |
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Don't want to hi-jack the post but just about to do the cam cover gasket on the tin-top. It's a weedy thin rubber jobbie. Any suggestions
as to how to stick it to the cover before dropping it on? Am thinking about blue Hylomar or maybe Wellseal? Thanks, Pewe 
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David Jenkins
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| posted on 29/10/10 at 03:37 PM |
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Sorry Alan,
My comment was made in 'Friday Flippant' mode! 
quote:
Originally posted by Alan M
I run my crossflow on twin delortos and until I fitted a catch tank and drilled the filler cap it developed enough pressure to blow the dipstick out!
In 2 years my engine has not leaked a drop of oil, the secret is to make sure the surfaces are clean and true.
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kendo
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| posted on 29/10/10 at 06:55 PM |
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Phew!
Made it.
Just completed 100 mile journey and only the tiniest little seapage at the ends.
Well done chaps.
First proper run and it was ace. Blimey its responsive. Took it easy as the roads were a bit greasy.
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