Fan Drive On GM

[luvrbus]

Do any of you guys know what the allowable end play is on the shaft where the 2 bolts and plate attach on the seal end of the fan drive this one has screws holding the seal in place with a 1/2 inch end play and the small plate is bent and cracked something is not right

I have the seal kit from Luke but I don't want to waste it and the manual I have does not tell you.

I was told 0.125 max is that right ?

good luck

[Red Rider]

Hey Clifford,

What engine are you working on? I looked this up in my "71" engine manual however it refers back to a belt driven unit. If it's the "Thermo Fan" they didn't give the info. They recommend contacting the fan MFG. Sorry.

[buswarrior]

Go looking for Bill Gerrie over on BNO?

He knows lots of good stuff, and knows the folks who know what he doesn't.

happy coaching!
buswarrior

[Utahclaimjumper]

Cliff,, are you working with the GMC "toro hydraulic drive" system??>>>Dan

[luvrbus]

Right Dan it is a hydraulic system on a 4905A have any good info for me besides leave it alone lol

good luck

[Utahclaimjumper]

I've only been as far as a seal replacement on one of those,, the seal should NOT be retained with screws, it is a press in seal.. I do remember no end play to any degree.>>>Dan

[luvrbus]

I can tell you what is inside those suckers now Dan lol,I am thinking the wrong front bearing and snap ring

good luck

[luvrbus]

Found the problem who ever rebuilt the unit left out the 3/8 spacer between torus housing and the drive hub housing the manual shows a gasket only

good luck

[Utahclaimjumper]

What problems did it create??>>>Dan

[luvrbus]

Dan it damaged the fan where the slots on the blade and those fans are a little pricey for a 40 year old bus lol

good luck and stay warm

[Utahclaimjumper]

We are doing great here,, up to 8 degrees this mornin,, probably high of 31 today.>>>Dan ( headed south SOON)