From dale_at_unofficialbmw.com Sun Feb 14 10:05:48 1999
Subject: Re: Re: 78-530i oil pressure
Date: Sun, 14 Feb 1999 10:05:47 -0800 (PST)
The 78 530i oil housing & canister was so troublesome, I'd crack looose
the thru-bolt, then remove the four hold-down bolts, and take the
canister/housing assembly to the bench for clean-up and install of a new
filter & o-ring.
Then install and finally give last torque to thru bolt.
Care should be taken to assure the internal spring and cap plate didn't
ge tossed out with the filter.
It's a fairly close fit between filter housing and motor mount & bumb-stop.
When the motor mounts sem squished out, change them.
The main cause for o-ring leakeage is double o-rings.
If upon filter change, the old o-ring stuck up into the housing instead
of coming off on the lip of the canister, then a new o-ring goes onto the
canister, there will not be an adequate seal between the two o-rings.
Sometimes you can drive for hrs, days......then it'll let go.
Replacement of the found o-ring will only get repeat failure.
It's difficult to see the o-ring up in the housinng. Use a mirror
Never re-use an o-ring.
If there's any deformation in the housing, or canister, no new o-ring
will seal it.
I frequently saw the steel type canisters badly bent.
Commonly there were two types of o-rings. Flat ones, and round ones.
I've had much better performance with the round ones. Be sure the o-ring
is for a 78 530i, not a 80 528i. It should go into place wiout being
streched, or compressed.
Thinner oil is definitely needed. An oil pressure test is called for
when the engine is hot and running OK. If it's still above spec, tha
by-pass valve (pressure metering device) is in need of work.
Dan Patzer the CyberWrench from BIMMERS ONLY
72' tii touring K75RT 85' 732i R1100GSA R850R
O.E.M. parts, Independant service since 1967
12724 Marine Drive, Marysville, Wa. 98271
> Thanks for your prompt response.
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> I use castrol 20-50 year round. the low temperature in the garage never gets
> below 35-40 F.(n. CA) I did use a factory filter. In 5 years this has never
> happened before. It sure felt as if the housing seated properly.