<VV> CRANkCASE PARTS

[Mark Durham]

Tony; If you have current running engines that otherwise have no urgent
issues, you may want to look at oil pump wear. All the oil goes thru there
and they do wear. Try tightening up the clearances there. If the gears are
scratched up, replace them. If there are deep gouges in the housing, replace
it. The cover can be polished smooth by using emery paper and water on a
perfectly flat spot (I used my granite counter top when my wife wasn't home)

Another option would be to add a higher volume pump to the engine. I also
added the longer pressure relief spring to mine to keep pressure higher
overall. Of course, if you have a confirmed flow issue, a heavier duty
spring won't raise pressure until a pump capable of exceeding the needed
flow is installed and adjusted correctly. That would be an easy and
relatively cheap way to troubleshhot the problem as well. Add the higher
pressure spring, if the low oil pressure problem quits, it was just a weak
spring.

Also, just using a heavier weight oil may do the trick for you.
I use a 5W 40 full synthetic that flows quick on start up but still is a
full bodied oil to provide maximum protection when warmed up.

Also, the amount of surface area there versus the main and rod bearings
where flow is very high, is exponentially small, I'd be more concerned about
rod and main bearing wear before case/cam wear.

regards
Mark Durham
On Sat, Jan 23, 2010 at 10:41 PM, Tony Underwood <tony.underwood at cox.net>wrote:

> At 02:00 PM 1/23/2010, Larry Forman wrote:
> >Tony,
> >I have had trouble with low idle oil pressure on several Corvair engines.
> >I am thinking it might be due to cam bore wear.
>
>
> Oil pump rotors wear as well, popular low pressure cause.
>
>
> >So please tell us what to look for since I have not started doing this.
> >Is it the cam gear end?
>
>
> There *is* more wear potential on the gear end.
>
>
> >Are there obvious wear burnishing marks or ??
>
>
> Yep.   I've stared at a few split crankcases along the way and a
> respectable unworn factory cut cam bore has a "look" to it that a
> bore worn by a cam journal does not.   The bores with low wear will
> have polish marks alongside what will appear to be the factory bore
> cut.   The cam will have burnished the "high spots" in the factory
> bore cuts.   The polished burnished spots won't occupy the entire
> bore in good crankcases... a worn cam bore won't be showing much if
> any of the factory bore cut.
>
> It's still possible that a cam bore showing burnishing around the
> entire bore surface could still be serviceable... but it should be
> checked out if it shows this sort of wear.   If the bores show
> evidence of the original factory cut throughout each bore's entire
> circumference I'd wager the crankcase would be fine.
>
> Still... a mic is your buddy.
>
>
> tony..
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