6 replies to this topic

[M111OWW]

Can anybody tell me exactly how the 3rd (smallest) cam bearing, the one next to the oil pump, gets its oil feed??

I have just stripped my engine back for some machine work and found significant damage to that bearing, it looks as if it's over heated at some point and begun to melt!!

Inspecting the block, there is NO oil passage way or relief in the actual cam bearing for oil to circulate!

It's an A+ 1275 block.....

[Spider]

On the back of the Pump, near the shaft, there should be a small hole, it's only about 0.020" in dia and easy to not pick it up.

 

That it is in the Oil Pump, it's unfiltered oil, so that wee hole can get blocked up.

 

None the less, it would definitely be worth checking the alignment of the Cam Bearing Tunnels.

[nicklouse]

some reading

http://www.nonlintec...te/lubrication/

 

it is lubed as the oil goes through the pump.

[M111OWW]

In what sense? That bearing looked to be completely free from any sort of groove or tunnel, just a completely plain bearing..

I noted that small hole in the pump casing and wondered if that had something to do with cam lubrication..

[Spider]

I've seen a few back Cam Bearings without the slot. I'm pretty sure these are non-genuine.

 

Without a slot of something like that, It's pretty hard for the oil to get in between the journal & the bearing and form an oil wedge.

 

Clearances are quite small.

 

Can you post up a photo of the bearing (as fitted) and also the cam shaft journal?

 

<EDIT: I've just had a quick read of the article that Nick posted up. I have to say, I don't quite agree with all of it, but moving on, the slot that I referred to here is quite small and is axial, not radial. It's only about 0.020" wide and maybe 0.010" deep (or less) >

Edited by Moke Spider, 26 September 2017 - 06:27 PM.

[nicklouse]

 

 

<EDIT: I've just had a quick read of the article that Nick posted up. I have to say, I don't quite agree with all of it, 

oh. i could not find anything really wrong. i guess it is on the return pathways?

[M111OWW]

Yup, but give me a few days as the engine is with the shop...