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  #16 (permalink)  
Old 02-07-2013, 12:19 AM
gearheadslife's Avatar
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anyone have photo's of a failed m55 pump, is the cause the pump housing or just the p/m gears failure
or ?

as far as the high volume pump. I only used one on my 355 because the spec's are on the loose side for running dual shots of silly gas..

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Old 02-07-2013, 05:07 AM
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Before I purchased a SB Chevy Melling Select oil pump, I E-mailed Melling and discussed this with George Richmond, their PR man. He said the thin castings were breaking just below where they attach to the main cap, mainly in engines that had solid motor mounts and some 4WD off road vehicles.

He went on to say that GM requested that the oil pump be made of thinner castings to save a few pennies. That sounds ridiculous but i believe him because that is the way the bean counters at GM does things.
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Old 02-07-2013, 06:51 AM
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Quote:
Originally Posted by MouseFink View Post
Before I purchased a SB Chevy Melling Select oil pump, I E-mailed Melling and discussed this with George Richmond, their PR man. He said the thin castings were breaking just below where they attach to the main cap, mainly in engines that had solid motor mounts and some 4WD off road vehicles.

He went on to say that GM requested that the oil pump be made of thinner castings to save a few pennies. That sounds ridiculous but i believe him because that is the way the bean counters at GM does things.
a few pennies x millions of sbc.. not hard to, not think g.m. would require that...
it was more likely g.m. had another surplier that walked in and said they could surply them for x amont less.. and g.m. told mellings if they wanted to keep the contract. they'd need to meet the oursourced surplier..
thats more of a believable been counter story..
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Old 02-07-2013, 10:37 AM
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That is correct.

GM is just like Wal-Mart. Those corporations will determine what they will pay for a something and some company will be more than happy to figure out how to provide it at that price.

Melling introduced the Select line of oil pumps for their high performance customers.
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Old 02-07-2013, 12:10 PM
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Quote:
Originally Posted by gearheadslife View Post
anyone have photo's of a failed m55 pump, is the cause the pump housing or just the p/m gears failure
or ?

as far as the high volume pump. I only used one on my 355 because the spec's are on the loose side for running dual shots of silly gas..
If I can remember. I have a couple of broken ones on "The wall of shame" I'll take a couple pics of them. They break between the mount boss and pump gear housing.

The only gear I have had break was because it sucked up a wire from a rotary Taiwan wire brush, that was used by the customer, to clean intake manifold area. That little 1/4" long piece of wire really cause some catastrophic results!!
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Old 02-07-2013, 12:48 PM
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Even so the vehicle it's going is a 4x4 when we did the fabrication for the motor mounts it was with the cab off the frame. We used standard chevy motor mounts and tack welded them to the frame in the Ranger.
We used custom cut angled steel plates about 1/4 inch thick that mount to the side of the block and angled them off to the stock ears which ride on the mounts.
The tranny mount is the stock ranger mount that was drilled in a new position for the TH400 tranny. So even with the mounts being rubber will it survive? Something else I thought I should mention is when I went and picked up the new M55 I took it out of the box and spun it with my finger. It moves super smooth with little resistance which is making me question rather or not the pump is any good as all the melling pumps I bought in the past always had resistance of the meshing gears that you could feel. So I wasn't sure if maybe they had did a improvement to the pump or if there's something possibly wrong with this pump.
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Old 02-07-2013, 02:52 PM
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I only worry if the pump binds a bit. I have had Dynagear pumps with the driven gear, axle pin, located out of proper position. Had to send some back.
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  #23 (permalink)  
Old 02-09-2013, 08:03 PM
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Your warnings were well heeded Bob. We was installing the screen on the oil pump, just starting to press it in when the pump broke between the mount housing and the pump itself and it broke rather easy. I inspected it and was really surprised to see it was made out of really cheap pot metal that was thin casted.
My nephew was somewhat upset as he's had other things go wrong and I told him "Be happy it broke here and not at the mud park where it would have took the engine with it"
When I got the M55 that I used on my 4.3 V6 back in '07 it was the old style pump and it was obvious it was made of better material. Isn't that something, used to we could get the M55 that lasted forever for $20 bucks. Now to get a good pump you gotta pay $75. I've been using Melling's stuff since I was a kid, hard to handle they went so cheap.
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