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Old 06-14-2006, 06:17   #1 (permalink)
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Oil pump pressure relief spring

How do you change the pressure relief spring on a Mellings oil pump?
Do you punch and rip out the welsh plug and replace the welsh plug with a new one? Or can you get at it some other way?

I have a new pump (pics of old pump) and don't want to damage it


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Old 06-14-2006, 16:36   #2 (permalink)
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Re: Oil pump pressure relief spring

Yes you will have to replace the welsh plug. I wish they would supply a new welsh plug with the spring.
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Old 06-14-2006, 17:13   #3 (permalink)
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Re: Oil pump pressure relief spring

Could you just tap the plug in a little deeper towards the spring and just put a washer or 2 between the plug and the cotter pin. Would this increase the oil pressure?
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Old 06-14-2006, 19:59   #4 (permalink)
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Re: Oil pump pressure relief spring

Quote:
Originally Posted by TMG70GT
Could you just tap the plug in a little deeper towards the spring and just put a washer or 2 between the plug and the cotter pin. Would this increase the oil pressure?
Would you trust that though?
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Old 06-15-2006, 03:03   #5 (permalink)
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Re: Oil pump pressure relief spring

To remove the welsh plug you drill a small hole in it and then screw a self tapping screw into it. The head of the screw provides a grip for pliers to leverage the welsh plug out. Take note of the depth of the welsh plug for reinstallation of the newly purchased one.
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Old 06-16-2006, 07:10   #6 (permalink)
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Re: Oil pump pressure relief spring

Well I thought I'd try the old one first. Punched a hole in it and levered it out with a screwdriver - too easy. Now lets do the new one - try the same way. Punch a hole in it a bit tougher than the old one but eventually goes in. Now try to lever with the screwdriver - much harder and start to bend the screwdriver.

Now I've either got to drill a new hole and use the self tapper, or get a die grinder and carefully cut the plug out. Doh!!!
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Old 06-16-2006, 07:44   #7 (permalink)
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Re: Oil pump pressure relief spring

Quote:
Originally Posted by shard351
Well I thought I'd try the old one first. Punched a hole in it and levered it out with a screwdriver - too easy. Now lets do the new one - try the same way. Punch a hole in it a bit tougher than the old one but eventually goes in. Now try to lever with the screwdriver - much harder and start to bend the screwdriver.

Now I've either got to drill a new hole and use the self tapper, or get a die grinder and carefully cut the plug out. Doh!!!
I doubt the die grinder method would work wihout damaging the case. I would try one or two self tappers to remove it. They are not very hard to pull out as long as the force is applied in the right axis.
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Old 06-17-2006, 05:18   #8 (permalink)
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Re: Oil pump pressure relief spring

5/16 bolt, some washers, and a shifter - bingo!
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