Date: Mon, 15 Jan 2001 20:29:59 -0800
Reply-To: Stuart MacMillan <macmillan@HOME.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Stuart MacMillan <macmillan@HOME.COM>
Subject: Re: BOSTON BOBS OIL PRESSURE THOUGHTS
Content-Type: text/plain; charset=us-ascii
No disagreement here. The point is the rods/rod bearings are the
problem with the 2.1. As Bob says, you are asking for trouble if you
"mask" the problem with a bigger oil pump, I know. I even ignored what
the oil pressure gauge was telling me. You probably could replace just
the rod bearings for some extra life, but the cost difference of doing
this compared to a complete rebuild would be hard to justify.
I've read that when a rod bearing is "lost", i.e., the bearing shell is
completely worn away, the steel on steel of rod on crank will get so hot
that sparks fly and the cap breaks or the nuts loosen, and the whole
mess self destructs no matter how much oil you pump in. BTDT.
Stuart
Robert Donalds wrote:
>
> Stuart wrote
> It's the rod bearings that tend to fail rather than the mains. They
> are
> smaller, thinner and less well oiled.
>
> Stuart and the list
>
> The rods on the 2.1 engine fail not for lack of oiling but because the
> big end of the rod
> goes out of round over time at 150k miles all 2.1 engines have some
> degree of con rod big end
> distortion
> The 1.9 has the same rod and it never fails the difference is the bolt
> that's used
> On the 2.1 engine the bolt is the stretch to yield type
> If somebody had this problem of low oil pressure and it turned out to be
> out of round con rods
> with proper inspection and measuring the main bearings could
> conceivably be used over
> or change the rods and rod bearing without splitting the case and keep
> the beast going
> for a while longer
> beefing up the oil pump is not a good idea to much oil pressure could
> create other problems
> like over pumping the lifters or giving the owner a false sense of
> security when it comes to oil lights and buzzers staying off. the rod
> will still blow because the clearance is to big no matter how much the
> pressure is boosted
> Both brands of wbx engine gasket sets have a pump cover gasket that
> measures between .008th and .006ths thick. the part # for the gasket is
> the same as a bug. those have always measured .004ths thick when the oil
> pump cover gasket thickness is doubled the oil pressure drops sometimes
> as much as 50%
>
> Bob Donalds
> http://www.bostonengine.com
> as always
> all rights reserved.
| 
