Are these oil gallery plugs? & Under crown oil jet method?
Turbo Mini Forums

Hello,

I am currently preparing my block to go to the machine shop to have it cleaned, skimmed and bored. I want to remove all oil gallery plugs to get it nice and clean on the inside. I have removed the four obvious ones (two on either side of the block) but I was wondering what these two items are (in photos below) and whether they need to be removed to give me access to the oil passages behind them?





I also intend to follow David Vizard's guide and this very useful post from Nic () in order to drill holes that will squirt oil on the underside of the pistons to aid with cooling. (won't use the BMW squirters that most people propose in the forums mainly for cost purposes)


What is not mentioned in the post explicitly but is talked about in DV's book is that you actually fit a 3/16 grub screw in the drilled hole and then put a 1mm hole through the screw to "regulate" the oil being squirted out. Can someone confirm this?

Since I haven't found a clear step by step "how to" on drilling these holes I intend to make one and post it here for reference.

Nik

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Edited by nikollou on 28th May, 2018.

For the love of cars!!

I still have this block in the garage if you need any further info

Hi Nic,

I guess it would help if you could verify whether there are grub screws fitted in those passages or not...?

For the love of cars!!

The BMW jets do have a ball and spring design in them. So in the event of an issue or low oil pressure this could help save your engine. Rather than an open hole.

That is a fair observation Jonny, I hadn't thought of that. I do however plan to have a pretty thorough "Engine Management System" so in the event of an oil pressure loss I will have lots of bells and whistles going off to keep me from destroying my motor.

Maybe what I can do is instead of drilling a 1mm hole through the grub screw as suggested by DV, I could make it 0.8mm instead.


Anyone that can comment on the "oil gallery plugs" on the photos I posted?

For the love of cars!!

those gallery plugs blank off the drilling that vent pressure from behind the oil pressure relif valve, theres no real " flow" through there, only what leaks past the oil reilef valve.

personally I leave these in place, but you clould pull them if your feeling particuarly thorough,

For the love of cars!!