Melling oil pumps
Thread Starter
Race Director
Joined: Jun 1999
Posts: 14,924
Likes: 9
From: Merritt Ils Fl
Melling oil pumps
OK guys, I'm kinda lost here. I am building a 383. Today was fit the oil pump day. My Kevko pan came with a matching pick up with 5/8th tube. My Melling pump is an M155HV, NOT an M55HV. It has a 3/4 inlet like the 10552 and looks like the 10552 except the relief spring is pinned rather than a screw retainer. Does anyone have knowledge about the 155, so far I have drawn a blank. BTW the packing box says "New Generation".
Drifting
Joined: Dec 2005
Posts: 1,360
Likes: 3
From: NORTHEAST
Here is a link with some info. http://www.mellingselectperformance..../OilPumps.aspx So far all the 383 engines we have built for street a strip whave used the 10553 with no problems.
Make sure the pick up is for a high volume pump or it amy end up to close to the bottom of the pan.
Good luck with your build
Make sure the pick up is for a high volume pump or it amy end up to close to the bottom of the pan.
Good luck with your build
Melting Slicks
Joined: Oct 2000
Posts: 3,426
Likes: 4
From: Heidelberg PA
Cruise-In V Veteran
If you are building a high performance engine - DO NOT USE A NEW GENERATION OIL PUMP. There should be a note with the oil pump that it should NOT be used in a high performance engine.
The new generation pumps are not as strong as the original pumps and have a history of cracking or breaking off.
Buy a melling select if you want piece of mind.
The new generation pumps are not as strong as the original pumps and have a history of cracking or breaking off.
Buy a melling select if you want piece of mind.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
are longer. The increased length of the pump body moves the inlet
for the pickup downward from the mounting point on the main cap,
placing it closer to the bottom of the pan.
Originally Posted by 85vet
The new generation pumps are not as strong as the original
pumps and have a history of cracking or breaking off.
pumps and have a history of cracking or breaking off.
If anyone would like assistance locating the Melling threads, post
again or PM me.
.
Burning Brakes
Joined: Jan 2007
Posts: 853
Likes: 0
From: Slinger WI
If you are building a high performance engine - DO NOT USE A NEW GENERATION OIL PUMP. There should be a note with the oil pump that it should NOT be used in a high performance engine.
The new generation pumps are not as strong as the original pumps and have a history of cracking or breaking off.
Buy a melling select if you want piece of mind.
The new generation pumps are not as strong as the original pumps and have a history of cracking or breaking off.
Buy a melling select if you want piece of mind.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
If you are building a high performance engine - DO NOT USE A NEW GENERATION OIL PUMP. There should be a note with the oil pump that it should NOT be used in a high performance engine.
The new generation pumps are not as strong as the original pumps and have a history of cracking or breaking off.
Buy a melling select if you want piece of mind.
The new generation pumps are not as strong as the original pumps and have a history of cracking or breaking off.
Buy a melling select if you want piece of mind.
Jake
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Burning Brakes
Joined: Jul 2006
Posts: 1,080
Likes: 2
From: Pittsburgh PA
first time i've heard of oil pump problems. I forget what i have in my 383. I think its a high volume standard pressure melling, and i want to believe its the 155HV pump. Working good for me, but i dont know if my gauge is accurate or not but my pressure stays jacked even at warm idle. Its 60 psi most always
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
first time i've heard of oil pump problems. I forget what i have in my 383. I think its a high volume standard pressure melling, and i want to believe its the 155HV pump. Working good for me, but i dont know if my gauge is accurate or not but my pressure stays jacked even at warm idle. Its 60 psi most always
This change made the casting thinner in certain critical areas and as a result there have been a lot of casting cracking and breaking.
That's the way the story came to me.
Jake
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
The pumps are shipping with a high pressure spring. Certain models
were advertised as having both HP & SP springs in the carton but
when polled, respondants indicated they had not received the SP.
A standard pressure spring is available from Melling on request. There
are at least two different methods of retaining the spring in the cap
of the pump (taper/split pin & threaded plug). This affects spring
diameter and length, so be certain to get the correct replacement.
Excessive pressure is undesireable.
.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
My vote is that the gauge is essentially accurate.
The pumps are shipping with a high pressure spring. Certain models
were advertised as having both HP & SP springs in the carton but
when polled, respondants indicated they had not received the SP.
A standard pressure spring is available from Melling on request. There
are at least two different methods of retaining the spring in the cap
of the pump (taper/split pin & threaded plug). This affects spring
diameter and length, so be certain to get the correct replacement.
Excessive pressure is undesireable.
.
The pumps are shipping with a high pressure spring. Certain models
were advertised as having both HP & SP springs in the carton but
when polled, respondants indicated they had not received the SP.
A standard pressure spring is available from Melling on request. There
are at least two different methods of retaining the spring in the cap
of the pump (taper/split pin & threaded plug). This affects spring
diameter and length, so be certain to get the correct replacement.
Excessive pressure is undesireable.
.
Not only "undesireable" but, contrary to what Melling says, excessive pressure will kill the drive gear on the distirbutor shaft (L98) or the stub shaft (LTXs). Ask me how I know.
On the LTXs that is particularly dangerous because even if the oil pump drive gear dies, the engine will continue to run as if nothing was wrong; that is up until the time the engine seizes because of NO OIL PRESSURE. Hopefully you'd see the CHECK GAUGES light before that happens, as I was lucky enough to see.
Jake
