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MG Midget and Sprite Technical - 1275 2-bolt oil pump

I'm just checking over a new oil pump before fitting it to my motor. Should the backplate have a smear of sealant, Blue Hylomar or similar? There was none when I removed it. Or is it supposed to leak into the tin cover on the engine backplate?
Is loctite the way to go if I can't use the 4-bolt tab washers?

Ta, Mark
M Crossley

I've always fitted them straight out of the box.

Normally with the 2-bolt, spring washers are used IIRC, although a dab of Loctite can't hurt.
Dave O'Neill2

I always strip mine down and clean up the casting/machining burrs so the oil flows through a little better, making sure not to leave any filings in there. Prime with engine rebuild oil to help with initial start up. Then just bolt it on with a new gasket.

Dave
Dave Brown

Thanks for your quick replies chaps. So you don't seal the back plate to the pump body?

Mark
M Crossley

Don't put hylomar near your engine! You'll find long strands of it in various oil galleries in years to come!

The backplate should be fine without a sealant but if you want to, Stags Wellseal, like treacle and never sets so won't break of strands like hylomar.
Robin Cohen

Make sure you seal the tin cover to the backplate - nowt wrong with Hylomar, if it is good enough for Rolls Royce it is good enough for MGs! Silicone sealants are more likely to block oil ways - but then no sealant should be applied to excess, just a smear on the gasket is all that is needed.
Chris at Octarine Services

Loctite 598 or 5910 are what I use for additional stiction and sealing - just a smear as Chris says...
David Smith

Ah Chris, thanks. I didn't realise that the tin pump cover should be sealed to the engine back plate. Is it supposed to be a tight fit? I assumed that it was just a dust cover and the area around the outside of the oil pump was dry.

Mark
M Crossley

No - if you look there is a cut out at on the pump that fits at the bottom to allow oil to flow back into the sump through a hole in the crankcase.

The tin cover is a reasonable fit but not oil tight, hence a smear of sealant on the flange.
Chris at Octarine Services

This thread was discussed on 01/07/2013

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