Hi all, someone may remember in a previous post of mine I was wondering about the rattle coming from my engine, and it was sort of narrowed down to the vac pump.
After listening to it closely for a while I decided to source a replacement from a Landy breaker on eBay.
It's a second hand genuine wabco pump in good nick and I fitted it yesterday - what a bloody fiddle job, compared to how simple it looks..

The old pump came off and the gasket was shredded, then I cursed my stupidity for not ordering a new gasket at the same time, so I fitted he replacement with a big bead of red gasket paste as a temporary measure... (Must order a gasket shortly)
Anyhoo, the reason the old vac pump was so noisy is because the mating surfaces of the plunger and the cam lobe were very rough - I'll put a pic on later. The new one is fine, but I expect it's going to get somewhat shredded by the rough cam lobe over time, but the question is how much time?

Am I looking at a replacement cam, or is the remedy out of proportion to the problem?
I know it's something that ideally should be done, but it's a relatively big job.
In the meantime I'll throw in some more zx1 to ease the friction and give the vac pump plunger a little protection and then when I pull it off to fit the new gasket I can see what sort of wear the cam is causing to it.

depends on cam but it sounds like it needs replacing ,hard facing isnt that thick

Would you say that's a DIY job? Re profiling the lobe is probably going to be the most tricky thing to do neatly I guess?

Would you say the cam would need to be TIG'ed or could I get away with an arc welder?

Having said that, if I'm going to the all the effort to get the camshaft out, I may as well just swap it out if I can source a decent s/h one.

You're quick off the blocks today JM - are you on LZ duty or something!?

Saltlick said:

Would you say that's a DIY job? Re profiling the lobe is probably going to be the most tricky thing to do neatly I guess?

Would you say the cam would need to be TIG'ed or could I get away with an arc welder?

Having said that, if I'm going to the all the effort to get the camshaft out, I may as well just swap it out if I can source a decent s/h one.

Click to expand...

you cant re profile it once hard facing has gone it will wear like butter

Sorry, I misread that, I thought you were suggesting to hard face the cam to then reprofile the surface - are these only case hardened then?
Hmm..

Saltlick said:

You're quick off the blocks today JM - are you on LZ duty or something!?

Click to expand...

i was late up ,just had breakfast so your timing was lucky,yes not too thick neither new cams arent that dear if indeed you do need one ,pics will tell