Cowabunga
Member
- Location
- Ceredigion,Wales
I wouldn't like to say which way to turn it or by how much, the chap who did mine worked for CAT (formally perkins) engines in shrews. I remember him saying there is an access port on the block side of the pump, but obviously you can't get to it. So top off, you will soon see which bolt, as its opposite the blanked off port. I recall it being a very small bronze coloured bolt with a 4 or 5 mm (iirc) head. He just adjusted it, reassembled it and said try that. It's never been touched since.
As @Henarar says, it may be a case of trial and error one turn at a time.
The access porthole can be used for more extreme adjustment when the top screw is at the end of its adjustment. It requires a bent and partly sawn off ring on a ring spanner to reach however many bolts are needed to slacken the ring off and slide it round and retighten.
It has been many years, decades even since I helped do this and it was on my Deere 6200 on which the porthole happened to be on the outer side, as indeed it was on earlier Perkins engines such as the 236 and 248.
Just had a look on YouTube and this is basically how it works.
Obviously you don't need to strip it down and the porthole for access to the two bolts to slacken to turn the ring can be seen with the blue Perkins tab. The two bolts holding the cover in place is usually sealed by a wire joining the two.
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