View Single Post
Costa P Costa P is offline
Slippery slope skier
Costa P's Avatar
Join Date: Sep 2010
Location: South Africa
Posts: 179
DIY tool for external oil thermostat cap

I eventually succeeded to remove the small cap (oil pressure relief).

This was my 3rd attempt after 2 previously failed attempts....more about those here:
930 rebuild – The revival of my mothballed project

I figured it may help someone else to know what worked for me, so here goes:

The mild steel “coin” was from the failed attempts. It twisted without handling much torque. I hacked the high strength steel version out of a chisel! It went into the slot nice and snug with the aid of a hammer.

The high strength steel version got the job done like a breeze. I used a 600mm long power bar with a 21mm socket over the hex of the chisel.
Surprisingly, the tip did twist and deform!
Costa P
'85 930 Grand Prix White ...the oil leak rebuild which mutated into MoTeC EFI+twinscroll GT35R+twinplug+ ...

930 rebuild – The revival of my mothballed project
Old 10-17-2018, 01:26 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)