Lister Engines > Original Lister Cs Engines

Lister 12/2 Fuel Pump Pushrod/Cam follower Wheel

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Samo:
The right fuel pump pushrod on my 12/2 has a cam follower wheel that's obviously been stuck for some time, it's worn a decent flat spot. Plus the wheel has quite a bit of play on the axle. Are these repairable? or do you normally source new units. The axle pin doesn't want to come out either, doesn't look tapered. I've tried a couple of heat cycles and some hydraulic pressure.  Info appreciated before I try more force.

cheers,
Samo

broncodriver99:
Hi Samo,

The fuel pump lifter on my 6/1 is the same way. There are some pics of it in my build thread. The tip of the pin on one end is tapered so it will only go in one way. I was able to disassemble mine pretty easily with a punch and hammer. I have scoured the web and several dealers and the roller is no longer available but the pin is still available from one source. I picked up an Indian lifter and it will work fine. I even tried swapping the wheel and pin over from the Indian lifter but the dimensions are different and will not interchange without modification. The Indian lifter uses a knurl on the pin to hold it into the lifter as opposed to the English original which uses a tapered tip. After a little cleanup and deburring the Indian lifter is decently made and the roller and pin are hardened and ground, I see no reason it will not work properly.

listard-jp2:
/\ I have to disagree.

In the case of a OEM Lister CS IP cam follower, the pin is parallel, and is retained in position by a straight pattern knurl

The pin can  be difficult to remove as the knurling effectively broaches part of the follower body when it initially assembled, and it will only come out one way due to it having straight pattern knurling on only one end of the pin.
Here is an example on ebay uk:  http://www.ebay.co.uk/itm/LISTER-3-1-2-1-6-1-8-1-12-2-16-2-VA-FUEL-PUMP-TAPPET-PIN-pack-of-2-008-02126x2-/262935648072

I do however agree that the roller is NLA, and Indian parts are not interchangeable with the body of the original Lister cam follower without further modification to the body of the follower, but the complete Indian assembly will fit, in place of the original.

I would also suggest that you pay close attention to the fit of the new Indian item in the cam follower bore, as it is quite common for wear to occur in the cast Iron bore, to such an extent that the housing can require sleeving back to the original size in extreme cases (1" bore if memory serves me correct).

Whilst your at it, what is the condition of the fuel pump cam lobe, as a frozen roller will quickly wear away at the tip of the cam lobe.

The situation you describe is very common to find, due to the marginal lubrication in this area of the engine and the potential for grit ingress, just be thankful you don't have a single cylinder version (as the oil pump cam follower also runs on the same cam lobe), and been non rotational it causes even more wear than the IP roller follower.

broncodriver99:
Pics.....

Original on the left/bottom. Indian copy on right/top. As you can see the original has a straight pin with a taper on one end(no knurling). Measuring the bore in the tappet one end is .002" smaller to receive the taper. The Indian copy uses the straight spline/knurl setup. Also, just noticed that on the Indian copy the center hole of the roller was drilled .010" off center, the adjusting bolt on top is off center as well, unlike the original where everything is properly centered as expected. Guess I will be tracking down something more usable. There are also some differences in the overall dimensions of the parts. The original measures .9975" and the Indian 1.00". The good thing is with the Indian part being a couple thou oversized it takes up a little of the wear/slack in the bore of the cam cover housing. The original pin is .010" larger than the Indian part, theoretically one could track down an Indian roller and hone it out .010" as the Indian roller does physically fit in the original tappet body but has very little clearance, a few minutes with a file should be all that is needed though.

38ac:
 As they said repairing the originals is not an option  for those not equipped with machine tools. I have made rollers in the past and pins but usually the Indian part works well enough and costs much less than the machine shop repair. I don't think I have ever seen a good lifter or cam lobe on the #2 side of a twin due to the fact it gets almost zero lubrication

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