oil pump plunger guide pin. 1955 g3lcs

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arty
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oil pump plunger guide pin. 1955 g3lcs

Post by arty »

Can somebody tell me if the guide pin threaded body has a fibre washer fitted under the hex. head or is it designed to go fully home.
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spookefoote1956
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Re: oil pump plunger guide pin. 1955 g3lcs

Post by spookefoote1956 »

I've got a thin fibre one on mine
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Duncan
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Re: oil pump plunger guide pin. 1955 g3lcs

Post by Duncan »

Just so you have both answers: No washer as it affects the amount the guide pin contacts the pump.
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clive
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Re: oil pump plunger guide pin. 1955 g3lcs

Post by clive »

No fibre washer listed in parts list. Never fitted one to any of my singles over the last 39 years. So its 2:1.
clive
if it ain't broke don't fix
arty
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Re: oil pump plunger guide pin. 1955 g3lcs

Post by arty »

Thanks for the replies gents, as Clive points out there is no ref. to one in the parts book and that prompted me to ask the question.
56G80S
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Re: oil pump plunger guide pin. 1955 g3lcs

Post by 56G80S »

No fibre washer on mine.

Johnny B
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spookefoote1956
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Re: oil pump plunger guide pin. 1955 g3lcs

Post by spookefoote1956 »

I correct myself and apologise from the heart of my bottom. I don't have a washer either.
Hail Joe Lucas ............ Prince of Darkness!
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein
arty
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Re: oil pump plunger guide pin. 1955 g3lcs

Post by arty »

Dropped the guide screw body today and found the guide pin had been put the wrong way into the holder and it also had a fibre washer fitted under the holder head.
Turned the guide pin the correct way and removed the washer but the holder or guide pin now tightens on the plunger before screwing fully home so it stops the slight to and fro movement of the plunger when pressed at the ends.
Reading the manual the plunger can be withdrawn from the rear end of its housing, am I reading that right?, and if thats the case is there a special way to reinsert the plunger to engage with the guide pin.
Mick D
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Re: oil pump plunger guide pin. 1955 g3lcs

Post by Mick D »

Hi

The workshop manual has this advice:

'Refitting the oil pump plunger. First renew the paper
gaskets on the pump end caps, stick the gaskets to the plates
with jointing compound.
Remove burrs or particles of old gasket from crankcase
faces. Take up the oil pump plunger, oil it and insert in
crankcase. Clean the interior of screwed body (6) (Fig. 1).
Oil and insert guide pin (5) as illustrated, the pin should
revolve freely. Fit the screwed body and pin with extreme
care to ensure the guide pin is located in the annular groove
in the pump plunger, using the finger to do so. It may be
necessary to revolve the flywheels to locate the pin. The
screwed body can be finally tightened with a spanner. Failure
to observe these important instructions can ruin the pump gear
beyond further use. Now fit the two end caps'.

You should be able to gently push the pin in whilst moving the plunger fore and aft to 'feel' it locate.

Regards Mick
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clive
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Re: oil pump plunger guide pin. 1955 g3lcs

Post by clive »

Arty you say the pin was inserted the wrong way. The correct way is with the shouldered section inserted into the holder. Put it in the other way and there is a risk that oil in the holder will stop it going fully home, and the other end, being stepped, will not induce enough movement in the oil pump.
clive
if it ain't broke don't fix
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