BBC M77 Oil Pump - Chevelle Tech
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post #1 of 49 (permalink) Old May 28th, 20, 2:44 PM Thread Starter
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BBC M77 Oil Pump

Im pulling the new M77HV out of my new 489 and installing a new M77, it came with a black spring (high pres. ?) I think I should take the pump apart and clean any casting crap out of it with a stone or dremel? and install the black spring? never opened an oil pump anything I should watch for? TIA, rick
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post #2 of 49 (permalink) Old May 28th, 20, 2:54 PM
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Re: BBC M77 Oil Pump

I just check for any sharp edge and deburr with a 3M pad or 320 grit paper. Check so the pressure relief valve moves freely, take out the plunger and clean it. Use the high pressure spring.
Check end play, clean it and fill it with some oil.
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post #3 of 49 (permalink) Old May 28th, 20, 4:27 PM Thread Starter
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Thanks Marcus 👍
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post #4 of 49 (permalink) Old May 28th, 20, 8:00 PM
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Why?
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post #5 of 49 (permalink) Old May 28th, 20, 8:34 PM
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Re: BBC M77 Oil Pump

X2, why?
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post #6 of 49 (permalink) Old May 28th, 20, 9:09 PM
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Re: BBC M77 Oil Pump

Had a m77hv in my car for a few years. 30 at idle 60 at cruise with 60 pound spring. 3 thou for rods and mains. Oil fed solid rollers. All is well. Running 10-30 oil.
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post #7 of 49 (permalink) Old May 28th, 20, 11:46 PM
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Re: BBC M77 Oil Pump

The spring is what controls the pressure. Just about any pump will make pressure with enough spring in it. A HV just gets there earlier. It helps low speed pressures and with looser clearances. A regular one will do fine.....but all the hype about a HV being an issue is just that.

You don't want to run around at low speeds in bypass mode all the time..it should climb as RPM climbs. If it's near pegged at idle and maxes at low RPM a smaller pump will help....but that's usually not an issue with most BBC that are built without super tight clearances.


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post #8 of 49 (permalink) Old May 29th, 20, 7:01 AM Thread Starter
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Re: BBC M77 Oil Pump

So Jim are you saying to leave the black high pres. spring out of the M77 and just use the spring that came installed? it's a freshly pro built engine but I don't know what the clearances are, I have an M77 HV SP pump in my 454 with 22,4xx mi. and it idles 30 psi and about 60 cruising so I originally thought the same pump for this engine would be a good choice but reading threads it seems like the M77 with a higher pres. spring is the way to go??
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post #9 of 49 (permalink) Old May 29th, 20, 7:07 AM
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Re: BBC M77 Oil Pump

Quote:
Originally Posted by shovelrick View Post
it's a freshly pro built engine

If that is the case why are you even messing with it ? Is there a problem ?? At some point in time you have to trust the guy that built the engine for you.
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post #10 of 49 (permalink) Old May 29th, 20, 7:16 AM Thread Starter
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Re: BBC M77 Oil Pump

Hi Bill, the builder did the machining, align hone mains & cylinders and assembled the Mike Lewis rotating assembly then I did the rest, guess I should say pro built short block
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post #11 of 49 (permalink) Old May 29th, 20, 7:17 AM
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Re: BBC M77 Oil Pump

Quote:
Originally Posted by shovelrick View Post
Hi Bill, the builder did the machining, align hone mains & cylinders and assembled the Mike Lewis rotating assembly then I did the rest

I still dont understand why you are changing the pump ?
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post #12 of 49 (permalink) Old May 29th, 20, 7:20 AM Thread Starter
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Re: BBC M77 Oil Pump

I started thinking it would be too much volume/pressure for a newly built motor...?
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post #13 of 49 (permalink) Old May 29th, 20, 7:28 AM
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Re: BBC M77 Oil Pump

Quote:
Originally Posted by shovelrick View Post
I started thinking it would be too much volume/pressure for a newly built motor...?

I dont know how you can "think" that without knowing exactly what the clearances etc are in the engine.


I know most guys don't seem to be fans of HV pumps but one thing I have learned over the last bunch of years working on Mercruiser marine big blocks is that almost every one of them has a M77HV pump in it and they run just fine that way. Every one I have freshened up or done from scratch gets that pump.



Without knowing exactly what your pro builder did I guess I just dont understand why you would second guess him unless you were actually having a problem.


Just my opinion,
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post #14 of 49 (permalink) Old May 29th, 20, 7:40 AM Thread Starter
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Re: BBC M77 Oil Pump

Bill I put the HV pump in without asking him what I should use, dumb on my part, I did ask a couple weeks ago and he said "Well if you're the kind of guy that likes to see a lot of pres. on the gauge it's fine" but then after reading a good amount of threads it seems like everyone uses the regular pump with a higher pres. spring ??? so I bought the M77 that came with the black spring, 2 actually, the M77HV is bolted to the engine now but the pan isn't on, I really don't want any problems with too much pres. if that's even possible ?
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post #15 of 49 (permalink) Old May 29th, 20, 8:00 AM
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Re: BBC M77 Oil Pump

Quote:
Originally Posted by shovelrick View Post
Bill I put the HV pump in without asking him what I should use

Ok, I thought he had installed that pump. Can he not tell you what the clearances are in the engine ? Tough call without knowing.



Unless they have changed something the M77 I have on the shelf comes with an extra blue spring for Corvette applications. I am pretty sure the blue spring is the higher pressure one ? It definitely is in the pump I have. Its been sitting there for a while so they may very well have changed the color of the springs.
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