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Oil pump damage

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catlotion Avatar
catlotion Toby M
Leeds, West Yorkshire, UK   GBR
Thought I'd check oil pump internals while I had engine out for clutch job. Oil pressure was ok but not what you'd expect for fresh engine.

Rotor and interior surfaces look pretty bad so going to replace (it's toast as John T would say). The engine has only done 3000 miles or so since rebuild but I did have issues with a blocked relief valve drilling which caused excessively high pressure so thinking that trashed the pump...

The surfaces in the pump housing seem scored as well...



Edited 1 time(s). Last edit at 2019-02-04 03:12 PM by catlotion.

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Richas Avatar
Richas Rich S
Portland, OR, USA   USA
you might want to pop a bearing cap or two...

Rich

catlotion Avatar
catlotion Toby M
Leeds, West Yorkshire, UK   GBR
I've removed a rod bearing and all looks fine. Might replace those anyway while it's on the stand.

Would rather not disturb mains but maybe it's prudent...

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barneymg Avatar
barneymg Barney Gaylord
(Somewhere in USA), Pick one (or more), USA   USA
1958 MG MGA "MGA With An Attitude"
If bearings look okay, it's probably not dirty.oil. That oil pump looks like 200,000 miles plus on a clean engine. Should not look anything like that on a 3000 mile engine. Someone reinstall a used oil pump with the last rebuild?



Barney Gaylord - 1958 MGA with an attitude - http://MGAguru.com - barneymg@mgaguru.com
(Please email me direct, do not leave a PM on the public server).

catlotion Avatar
catlotion Toby M
Leeds, West Yorkshire, UK   GBR
It looked fine on installation but I didn't know it's provenance. Should have replaced in hindsight but had many other bits to buy at the time.

I had to do a number of tests to cure high pressure issue. Never started it but cranked a number of times at over 120 psi. Presumably rotor damage occurred then...

I'm going to have a look at mains too but rod bearing looked fine. Cylinder walls still look nice. Oil has always been clean and nothing suspicious on magnetic sump plug...


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