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MG TD TF 1500 - Oil pump groove

Whilst stripping and cleaning the oil pump on my TC- so the early type with separate filter, I noticed that the oil groove inside at one end of the distribution cylinder is blocked off with what appears to be solder. I did not notice on dismantling which end the "blockage " was so need the following questions answered please. Which end should the blockage be- nearest the engine block or the cap. My belief is the cap end, Plus the blockages' purpose. My assumption is to force the groove to supply the necessary lubrication to the shaft.
JK Mazgaj

Apparently this is not normal and it's been suggested by Steve Baker that it may be a piece of bearing white metal that found its way into the grove.
JK Mazgaj

Hello JK. If you are talking about the groove shown in the attached picture, It should be as shown with nothing blocking it. It provides lub oil to the driving shaft and should be facing the body, not the cover. This was an old gear and is not usable as shown it would need to be ground flat it has too many nicks. I hope that this answers your question if not post a picture of what you are talking about.

Butch T

R Taras

Hi Butch, No it's a spiral groove on the internal bore of the gear. Not sure it's easily visible in the photo as difficult to light.

JK Mazgaj

I think that has been there since the gear was fitted. There is no pressure differential between the top and bottom of the gear to drive debris into the bearing.
Ray TF 2884
Ray Lee

Not sure why someone would block an oil grove with solder. like Steve said possibly white metal from a bearing.
Don't have a TC but can't remember what was in my TD gear when I put it together in 1972.
However, I was impressed to see you wearing rubber gloves. As a Brit MG owner, I don't think I have ever done that. Oily fingernails are a rite of passage. I think even when I got married, there was a spot of 20/50 Duckham's somewhere on my suit :)
Rod Jones

I have a box of laytex gloves on my toolbox. Every day I go out to work on the cars and say to myself, "I don't need those today, I'm not planning to get very dirty." And every day I regret it when I'm scrubbing embedded grime out of my skin. And I say the same thing when I'm deciding whether to change to grubby clothes. My "garage pants" pile is now bigger than my clean pile.
Steve Simmons

Hi JK. I've seen a couple of those bushings that have the spiral oil grove. As long as one end is not blocked it should be ok. You will find that the gears wear differently in the body. The drive gear is pulled against the bottom of the body and wears mostly into the body. The driven gear rests against the cover and wears into that. When I rebuild the oil pumps I grind the cover flat on my surface grinder, The body is then ground to remove any scratches on the surface(this is where most oil leaks come from) Then each gear is ground to the proper end float in their bore .0015 to .003.

Butch





R Taras

I must confess that the "rubber gloves" are a bit of a carry over because of the virus. BUT I would add that as a result of developing industrial dermatitis in the hands years ago when prolonged working on my oily cars and not cleaning them properly they are helpful if working with oil and petrol for prolonged periods. They are a dam nuisance when working with fiddly bits then I take them off, put back on the gloves without cleaning, hands perspire and up comes my bodies reaction. Itching for hours!!
JK Mazgaj

This thread was discussed between 12/09/2021 and 17/09/2021

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