37 replies to this topic

[cristiano1968]

Hello
Seeing I'm in complete lockdown here in Italy?.im doing some work in my mini engine 998cc a + 1989.
Anyway ,I removed the 2 oil gallery plugs from either side of engine.
Getting it ready for the machine shop to clean and rebore ect.
I checked all the openings from bearings and pil filter and all other holes to check nothing is blocked.
Well one seems to be blocked the bearing on oil filter side which I think it goes to the inside opening of the oil gallery plug end
It seems to finish there but seems blocked
O put a small camera with a light and from the gallery hole end just shines a bit of light.
Any help.
Would be gratefully thanks.

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[DeadSquare]

Don't worry, the rear main bearing oil has to flow round the oil pressure relief valve.

[cristiano1968]

So it should be closed then?

[DeadSquare]

No, the bit of metal that the thimble on the end of the spring of the pressure relief vavle, pushes against, is shaped like a 'dumbell', so that the oil from the pump flows through the center, and the oil in the gallery flows round the outside.

 

It can be removed by tapping a thread through the center, and extracting it, but if I were you, I'd just leave it all as it is.

[cristiano1968]

I think I get it.
I pushed a tiny slim camera up the bearing hole and it hit something
I guess the relief valve .
Some light a little shined through in to the gallery hole channel.
So what would u suggest just leave it or get it out?

[DeadSquare]

Just leave it.  Good blasts of compressed air will clear anything out

[unburntfuelinthemorning]

Check this thread out.

[cristiano1968]

I think I did something stupid
,
When I thought it was blocked
I put a thin screwdriver in and gave it a few taps
I thought it was a build up only realising it was the relief valve?

[DeadSquare]

I think I did something stupid
,
When I thought it was blocked
I put a thin screwdriver in and gave it a few taps
I thought it was a build up only realising it was the relief valve

 

 

Now you tell us !!

 

That might change everything

 

If you can see a mark on the coned surface of the pressure relief valve seat, you don' have much option but to buy a new "dumbell" insert to replace the damaged one that you are going to have to tap and extract.

[cristiano1968]

Yep I'm daft.
I'll take it out today see what it's like
Can see if it's damaged with my micro camera.

[cristiano1968]

Meant to say I can not se if it's damaged with micro camera

[DeadSquare]

If you take it out:-                 

 

AS    SOON    AS   IT   IS   OUT,   MARK   THE   SIDE   WITH   AN   ARROW    TO   SHOW   WHICH   WAY    IT    GOES   BACK   IN

[cristiano1968]

Will do??

[Rorf]

I doubt a few taps on a screwdriver will have done any damage on the oil thimble, it is after all made out of a very strong steel

[Spider]

The Seat is removable from the Block

 

 

It's the part on the right here, however, as Rolf has said, it would need quite a whack for the center part of it to get damaged. You might have marked it though.

 

All the same, I do routinely remove the seats from the block for clearing and inspection. Sometimes they are clean around them and sometimes that are not.

 

I tap a 3/8" UNC Thread in the Seat (you can just reach them with an ordinary Tap), screw a short Head Stud in to them, then with a Socket (as a packer) and some washers, use a Head Nut to pull them out.