Thread: ARB Compressor Rebuild

A few questions for someone more experienced than me

Went into ARB today, was surprised they had all the parts I wanted in stock

Righto the questions:

The bearing at the bottom of the conrod/piston assembly, should this be packed with grease before I refit it?

It then says to tighten the cap screw which holds the piston to the crank to 11Nm; I dont have a torque wrench which makes it a little hard? Stupid question but how important is it to do the set torque?

Also the head bolts need to be tightened to a certain torque

What would you do?

Thanks

I wouldn't worry too much about the torque settings. 11Nm isn't very much (@8lb/ft)

Not many torque wrenches would do that accuratley. You would need a small one.

I would just tighten it to a reasonable level with the Allen Key.

Rgds
Pete

Just do them up reasonably. 11Nm isn't a lot at all and the aluminium body will strip very quickly - if you're not happy then use a small amount of low grade (vibration blue) loctite. The hex bolt that holds the bigend bearing only does just that. The bearing is then an interference fit into the conrod - without disassembly, check that the bearing is still in there properly and not lose - if it is lose then replace it or bodgy it with loctite otherwise it will come apart while operating. I loctite the big end bolt too.

This said, the piston looks like it hasnt done much work at all.

For the bearing, its a sealed non-servicable bearing so don't sweat. if its gritty then you might washing it out with something like petrol and then soak lube back into it. If it spins freely then just leave it. IIRC I used to clean those types of bearing with WD40 spray and then I think it may have even been chain/bar lube that I used to run back in because it has some thickness and retaining properties.

Thanks I was thinking it wasnt too important

Is the Loctite on the head bolts important?

Havent got any

Thanks

Originally Posted by Jock The Rock

Thanks I was thinking it wasnt too important

Is the Loctite on the head bolts important?

Havent got any

Thanks

I dont think so because the thread on those screws seem to generate a lot of friction anyway. The big end I would loctite on the thread only.

Might have to go and find some Loctite for the hex head then

It says to use 272 does that sound right?

Thanks

It'll be something like that. I used the Permatex red instead which I think is the equivilent, or at least similar.

They did have to call it PUKT for a rebuild diagram didn't they!