 Melling M-79AHP Oil Pump |
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| #27GLA |
 Jul 29 2015, 05:44 PM
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#1
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Newbie  Group: Members Posts: 7 Joined: 7-May 14 From: Michigan Member No.: 17,319 Region Association: None  |
Anyone else using this oil pump on their Type IV engine and finding it leaks?
Having issues trying to get the cover plate to seal..... Cover plate was leak free prior to rebuild......mechanic cleaned up.....reused and installed with paper gasket and Permatex Aircraft grade sealant.....no leaks till I went to track and got black flagged.....excessive smoke from under car.......Took it a part.....resealed and still leaked in the shop Purchase new unit......sealed per instructions.....still leaks Called Melling Pump......they can't figure it out either but overnighting new gaskets of several styles.....Installed new gaskets per their directions....still leaks Going to Melling tomorrow as their manufacturing/RD is an hour away Besides Melling......what other High Volume pumps are available that are reliable Any use an O-ring to seal instead of a gasket |
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| TVRLOTUSTR3 |
Jul 30 2015, 05:17 AM
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#2
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Newbie Group: Members Posts: 24 Joined: 11-October 06 From: Shenandoah Valley Member No.: 7,024 |
I cut a groove in the side of the pump and install an O ring. Works great, no leaks! The only problem is you need a lathe.
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| Firstcar |
Jul 31 2015, 09:56 PM
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#3
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Obsessive amateur mechanic Group: Members Posts: 97 Joined: 17-March 11 From: MA -South Shore Member No.: 12,831 Region Association: North East States |
I think this has been "covered" elsewhere but the cover supplied with the Melling is a source of leaks - it flexes. I bought a type I cover from the Type IV store and it solved the problem. Applied Permatex 3H to case, gasket, and pump body. Applied Hylomar to cover gasket. Installed cover, Permatex 3H on studs, added wavy washers and torqued to 14.5 ft lbs. - no leaks.
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| #27GLA |
Aug 1 2015, 06:20 AM
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#4
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Newbie Group: Members Posts: 7 Joined: 7-May 14 From: Michigan Member No.: 17,319 Region Association: None |
Firstcar.......thanks for your response
Agree with the cover plate as the issue Did try a stock VW cover plate my mechanic had in stock.....but could not get in onto the studs as there was not enough clearance using the Tangerine Racing fan set up...........some mods could be done to get one past Which type Hylormar sealant do you recommend?..............see there are several grades My visit to Melling was fruitful as they gave me a brand new pump they tested that AM.......it still leaked but considerable less. Melling also prefers that you use no sealant at all Searched forum but did not find a related thread..... |
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| Mark Henry |
Aug 1 2015, 06:39 AM
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#5
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
I for one consider mellings to be junk.
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| Firstcar |
Aug 1 2015, 01:23 PM
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#6
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Obsessive amateur mechanic Group: Members Posts: 97 Joined: 17-March 11 From: MA -South Shore Member No.: 12,831 Region Association: North East States |
Hylomar 71285:
http://www.competitionproducts.com/Valco-H...5/#.Vb0b2Ur3arU The stock Type I cover has raised edges on all four sides, which prevents the cover from bowing. Some grinding away of one of the corner's raised edge is required to fit the fan shroud boss on the Type IV engine. |
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| #27GLA |
Aug 3 2015, 07:10 PM
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#7
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Newbie Group: Members Posts: 7 Joined: 7-May 14 From: Michigan Member No.: 17,319 Region Association: None |
Have the stock plate and the sealant..............now to get to work
Yep........will need some mods to the plate to fit |
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| Jake Raby |
Aug 4 2015, 08:06 AM
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#8
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
The problem is these pump bodies are machined before they are properly cooled.The bodies are elliptical and will not seal.
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