I've never had any luck trying to remove the front cover without damaging
the head gasket, but that's usually a situation where the engine has been
run for a long time and the gasket is thoroughly cooked in place.
I'd go ahead and drop the oil pan. It's easy enough to do. The oil pan bolts
are only torqued to about 3-5 lb/ft, while the head bolts are at 65 lb/ft,
so there is likely to be more pressure from above than below.
The front cover has to come straight off because of the studs for the water
pump, so easing the pressure from the head should help. You might also want
to remove the upper timing chain tensioner so the chain is slack, too.
Here's what the arrangement looks like:
http://www.gordon-glasgow.org/Images/Fully_Installed.jpg
I'm betting the problem is not the timing chains anyway, unless something
has fallen down the front cover and has jammed up somehow. If that isn't the
problem, you should plan on pulling the engine out and disassembling it.
The front cover gasket is actually two pieces, one on each side, and they
are paper gaskets, not cork. I think the oil pan and float bowl gaskets are
the only cork gaskets on a U20.
Gordon
Renton, WA
1967 2000 #430
> -----Original Message-----
> From: owner-datsun-roadsters@autox.team.net
> [mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of roadster68
> Sent: Saturday, October 01, 2005 2:18 PM
> To: datsun-roadsters@autox.team.net
> Subject: Timing Chain Cover Removal
>
>
> Hello Listers, Can't remember if I updated the list on my roadster woes.
> Starter is kikely okay so engine appears to be seized up
> somewhere. I know
> that more than one of you asked me if the motor was too tight.
> Now locked
> up totally. Will now check timing chains to see if they are
> binding up. I
> need to know the finer points of removing the timing chain cover. I have
> just removed the pulley, all the cover bolts, two small bolts
> from above in
> the head and 4 from below on the oil pan. Do I have to back off
> all oil pan
> bolts so the bottom of cover clears the oil pan? Also do I need
> to back off
> head bolts too - seems extreme? I was told the cover should have a cork
> gasket on it too. All I can see is a very pliable goo. Could
> the rebuilder
> have just put some form-a-gasket on the gasket? I can see no way
> of saving
> the gasket if in fact it exists. Any help would be greatly appreciated.
> Larry.
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