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Old 24-05-2010, 07:14 PM   #1
swampy21
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Default freeing stuck oil pressure relief valve.

Fairly sure I've got a stuck oil pressure relief valve on my 1600tp.

Just trying to find out a couple of things before i tackle the job.

Firstly Ive seen a tool advertised to remove stuck valves.

Is this:

a) absolutely essential, its not worth trying without one.
b) useful, but you'll get it out without one, it'll just take you longer.
c) another completely unessesary peice of tat, that someone is selling as a specialist tool at rediculously un-justifiable prices.


Secondly, anyone know how much of the oil will drop out when i remove the plug?

I'm gonna change the oil anyway, but i'd quite like to ensure i've fixed the problem before putting new oil in, to avoid having to drain brand new oil out, if the problem isn't fixed first time around.
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Old 24-05-2010, 09:57 PM   #2
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Those tools are useful, but not esential. I've removed sticky oil pressure relief valve 'pistons', with a Rawlbolt, to grip the inside of the piston, then pull it down and out. A piece of wooden dowel, of the right diameter, with a split cut into one end, and a small wooden wedge in the split, can be jammed into the piston, and grip it enough to pull it out. In a roadside emergency, I got one out with a stick cut off a small tree, and a little wedge in the end of that. Expect the oil from the gallery and the oil cooler to drain when you remove the piston, the contents of the sump will stay inside.
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Old 24-05-2010, 10:01 PM   #3
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Thanks for that.

Also am i likely to need to replace any of the bits - piston/spring?? or can i likely clean it up and replace,

The valve is sticking after being laid up for the winter, so I'm presuming nothing is broken in there.
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Old 24-05-2010, 10:04 PM   #4
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Unless the piston is badly scored or corroded, a clean-up should be all that's needed. A new sealing ring for the slotted plug is a good idea though.
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Old 25-05-2010, 12:37 AM   #5
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If the engine is still in the car and the oil is in the sump, I expect you could remove the leads from the coil (so the engine can't fire), then crank the engine on the starter to use oil pressure to blow the piston out.

Dave.
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