help with devilbiss 432

gapfast · Dec 23, 2012

I found this forum through extensive searching on info on my newly acquired air compressor. <br>Bought it several months ago and just now getting it wired up. When I fired it up I hear a bit of a knock I notice the belts are pretty loose so I replace them. Still don"t have them tightened enough I don"t think. Whats the secret?<br>After further investigation there seems to be some play at the crankshaft. I assume it needs new bearings. Does anybody sell those? I"m sure there will be more as I get tore into it<br>Phil

XRogerX · Dec 25, 2012

I assume "some play at the crankshaft" means you can rotate the flywheel without hearing or feeling any resistance for the first bit? If so, I would suspect wear on the small ends, or a worn crank. If these machines are run low on oil, the oil slinger rings on either end of the crank have nothing to pick up and the rods and pistons will run dry, with the usual results. Other than that, the locking bolts and nuts holding down the valves may be slack allowing the valves to move around in the head. You won"t know until you tear it down. Everything on this pump is rebuildable; whether it"s cost effective to do so is another matter. It"s an excellent pump though, absolutely top quality, good up to 7.5hp, maybe even 10 if you push it.

XRogerX · Dec 25, 2012

If it"s the main crank roller bearings, they are quite common, off the shelf items. If they flywheel is moving, it is probably loose. It is a taper shaft, so if it is not snug, it will wobble.

rpllr · Dec 26, 2012

I rebuilt a devilbiss 445 pump and found parts online, bought rod bearings, rings, gaskets and valve parts for little over 300. Mine had a little rust at the top of the bore from sitting and was causing a knock.

gapfast · Dec 29, 2012

I just tore it down completely. Mosty oily water sludge inside. Crank and rods look rusted quite a bit.
haven't got bearings off of crank yet. There not just sliding off. Gonna clean it up a bit and go from there. Where is the best place for parts?

XRogerX · Dec 30, 2012

You can knock the roller bearings off pretty easy with an air hammer but be careful not to wreck the sheet metal cups on either end of the crankshaft.

Independent Components Corp and Parts Service International supplied most of the stuff I used to rebuild with. I"d go with OEM valve springs though, and double check bearing clearances and ring gap.

gapfast · Jan 1, 2013

Crankshaft is in pretty rough shape! Id post a pic but my phone doesn't like it

gapfast · Jan 7, 2013

flywheel is 19". Papers I found on it say need a 20". Is that common?
parts service international said they had no parts. As far as icc they only sell to suppliers.
Maybe this thing is not worth rebuilding. I'm still pushin fwd though!

gapfast · Feb 26, 2013

Roger, u had mentioned lapping valves in another thread. I
have my valves pretty clean and I"m unsure what two edges
u speak of. Could you post a pic? Also seen springs put in
several ways. Which way do you prefer?
Thanks
Phil

bpenford · Mar 11, 2013

Hello if your 432 isn't worth rebuilding I would be interested in buying the pistons and valves.My 432 blew a Hp Piston assembly

help with devilbiss 432

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