oil pump replacement how hard is it?
Jason LaMar
I have a 91 S10 Blazer 4x4 (4.3) 116k that runs great and want to know how
hard or how long it takes to replace the oil pump. The oil pressure has
taken a small plunge recently (even with 50 weight oil it never gets past 40
unless floored then maybe 45 then if you keep it floored for about 10
seconds down to 30-35) and I think the pump may be weak. If there is an
easier way to fix this problem any help is appreciated. Oh I also had the
oil pressure guage sending unit replaced last year.
thanks
jason
Mike
slightly...
Big Daddy
>Only way to do this is to remove the oil pan, which means lifting the engine
>slightly...
>
'91 S Blazer 4x4? Yeah, slightly, like about 2 feet. At the dealer,
we drop the front axle out of it...it's easier than removing the
engine...but only just barely, and then only if you have a rack.
Big Daddy
ICQ#6342575 AOLinst messenger "crowfam4"
ASE Master Auto Technician
Chevrolet Certified Master Tech.
High Sierra
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"Big Daddy" <walli...@hotmail.com> wrote in message news:3993c833...@news.mvtel.net...
Mike
should be 30-55 PSI. It only lists one 4.3L so I'd guess it was the same from 88 to present...
Big Daddy
>I'm not Big Daddy, but I happen to have my Haynes manual in front of me. For the 4.3L V-6 engine it says 10 PSI is sufficient at idle (500 RPM), at 2000 it
>should be 30-55 PSI. It only lists one 4.3L so I'd guess it was the same from 88 to present...
>
>High Sierra wrote:
>
>> What is the correct idle speed and cruising speed (200rpm) oil pressure for a 4.3L engine, from the shop manual? Has it been the same since introduction.
>>
Well, I *am* Big Daddy<g> and for once the Haynes manual agrees with
the factory manual. 10 to 55 lbs, and they're all the same. I think
the blocks are all pretty much the same and most of the differences in
the engines through the years have been in the induction systems.
High Sierra
Mike
High Sierra wrote:
> Well I guess the Chiltons manual is wrong. At least my copy. On page 3-24 in the Engine and Engine overhaul section there is a table that lists things like horsepower, torque, bore&stroke, Compression ratio and oil pressure for all the engines. It states 18lbs at 2000 rpm for the 4.3L. It give the ratings for all engines at 2000 rpm.
>
> Does anyone think the Chilton's manual is correct?
>
> Where can I get a Haynes or Shop manual?
>
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> "Big Daddy" <walli...@hotmail.com> wrote in message news:399523e1...@news.mvtel.net...
Jason LaMar
Thanks for the responses. I guess I will wait on the pump replacement
unless it REALLY needs it. Even though 30-35 is fine at 2000 it used to be
a little higher not too long ago and that was when I was using 10w30 (yes a
regular oil) earlier in the summer. I now use 5w50 Castrol Syntec, which I
started using after the pressure drop, (yes it can be used in older cars)
and the pressure did go up at first but only 2000 miles after the oil change
it is now back to where it was. I'm taking the truck to a mechanic to have
some other work done but I will have the mechanic test the pressure with a
mechanical guage. I don't know maybe I'm being a little too concerned but
then again it would suck if the oil pump happened to quit when I'm
driving...
jason
Jason LaMar <jasl...@prodigy.net> wrote in message
news:8mvqnt$203a$1...@newssvr05-en0.news.prodigy.com...
GregB
derivatives which includes the 4.3L.
High Sierra <gew...@nbnet.nb.ca> wrote in message
news:d3cl5.974$bW2....@sodalite.nbnet.nb.ca...
High Sierra
Warmed up at idle is 25-35lbs.
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