are the new replacement oil pumps still the lighter ones that can break?

or did they finally fix this issue ?



thanks

 

I'm guessing this "problem" wasn't fixed. I also wouldn't lose sleep over it...

 

They arent going to 'fix' the problem. This is the future.
As far as the pump, I wouldnt use it. I've read and heard of too many failures with people that always used the tried and true M55. IMHO its now a piece of junk rated as well as anything from China. Maybe it'll be fine on your application, but why run the risk? Some things are better left alone, this was one of them.

 

Supposedly the old casting is the M155 now.

 

Hmm, other than the price being double (ooh, $34 vs $17), they look pretty similar on summits pictures. Summit doesn't list any differences other than the M155 has "recommended hardened pump shaft"
Interesting.

 

After researching this, I went with a jegs oil pump, #555-23501. The neck is a thicker casting and it's a stock volume pump. It costs around $34, but I think the extra cost is worth the piece of mind. It also comes with three different pressure springs that are held in by a bolt instead of a pin so they are easier to change out.

 

hmm so im confused now

its kind of a dilemma

because im in charge of assembling the engine for my stepdad -after the block and heads and crank are done at the machine shop, he is buying the parts and paying for the machine shop labor and all that,

he is not knowledgable on this particular subject at all i have not told him about this problem
and he is actually stuck in the old dinosaur days of sbc engines and old school racing and such,
i already know that he wont opt to wait on a pump from a catalog place to get here beacause he will want this engine back together and back in the car ASAP - in which is why i just pulled the engine out and totally stripped it down to a bare block in less than 24 hours now.,

the machine shop guy does machine work AND also re-assembles engines(i will be re-assembling ours though)


maybe he has a way to get or a supply source of pumps that arent thinner casting possibly

i'll have to try asking him

hmmm...

hopefully i will find out tomorrow when i hopefgully will be droipping off the pistons rods block crank and heads

i hate to go ahead and get a thin cast pump with the risk potential of it breaking and well you know the rest

but i also read that the highest risk of pump casting breakage is when it is used in an engine that is above stock

how true is this ?

just trying to get all the info i can while i try and figure out what i should do here - an engine thats not even mine is at risk here




thanks

 

I built a new motor for mine last (06) spring and then 3 months later read about these pumps. Any pump made in 06 is this new casting. The issue is the outside of the casting has been thinned out. On a standard volume pump its not an issue but on the HV pumps that are bored out for larger gears, this creates a problem. Under severe conditions these castings can fracture and fall into the pan. As it turns out I lost a tooth on the flywheel this spring so I pulled the motor and sure enough, that was the pump I had. I went to a local supplier and rummaged through about 20 mellings pumps on the shelf and found an old style casting. BIG DIFFERENCE! Be carefull as mellings casts alot of other companies pump casting for them.

 

The HV pumps use the same diameter gears, just taller.

 

Hey Randy, if you buy from Summit online using a credit card, their shipping is lightning quick, so it's really not gonna hold up getting the motor finished. I usually get my parts within 2-3 days doing it that way. Besides that, I'd just level with your stepdad and tell him you're not willing to put your reputation on the line, since you're assembling the motor, by putting a junk pump in it. If he's anything like my old man, it'd be my fault no matter what the actual case may be.