I put the bolt inside the end of the spring--basically using the bolt head as a
shim (about 1/8" thick).
Bob
On 4/30/2011 8:44 PM, Mark LaPierre wrote:
> You lost me Bob?
>
> Where did you install a 1/4 inch bolt?
>
> Mark
>
>
>
>> Background: my BJ8 has run low oil pressure at idle for as long as I've had
>> it. At startup I get 60psi, but after
>> running on hot days I would register, for all intents and purposes, zero psi
>> at idle. In spite of this, the engine
>> has run and performed well for me for over 100K miles. I use 20W-50 dino oil.
>>
>> There has been a lot of discussion on the BCF about replacement relief valve
>> springs being shorter than spec. It has
>> been suggested that putting washers or other shims or a 1/4-inch bolt behind
>> the spring could increase running
>> pressure. I actually didn't believe it because AFAIK the valve is there to
>> keep pressure from getting too high, and
>> presumably would be fully closed at normal running pressure. But, I was
>> curious ...
>>
>> So today I pulled the relief valve and measured the spring at 2 & 11/32";
>> quite a bit less than 'spec.' So I
>> installed the 1/4-inch bolt and fired her up; 70psi on cold start/fast
>> idle--not too surprising. What's surprising is
>> even after the engine has warmed-up--when I would normally see 10-20psi,
>> before a long run in hot weather--I am
>> getting 40psi. And the max pressure is still at 70psi; so the effect is max
>> pressure is up 10psi, but the hot idle
>> pressure could be up 10-20psi!
>>
>> My questions to the forum are: is 70psi too high a max oil pressure? Any
>> explanations for this phenomenon? Should I
>> split the difference with some shims? Go back to the spring-only setup so I
>> can sleep?
>>
>> Bob
>>
>> --
>> *******************************************************************
>> Bob Spidell San Jose, CA bspidell at comcast.net
>>
>> *******************************************************************
>>
>
>
--
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Bob Spidell San Jose, CA bspidell at comcast.net
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