300+ rebuild

[Freightrain]

6 minutes ago, Joey Mack said:

Oops. Your right, I just did the math....  🙃

I may be screwed up.  Pull clutch would wear the rear side(pulling crank towards rear).  The pilot bearing would wear front due to crank being pushed forward.

Time to relax before I get too wacked out on my thinking.

[Joey Mack]

Yep..  I just realized i was too quick to doubt myself.. I did a do over on my math..  

[mechohaulic]

3 hours ago, Geoff Weeks said:

Generally, here if the rear mounts are on the engine 1/2 of the bell, a rear transmission "leaf spring" type or rubber bisket mount is used. On set-up's where the rear mount is on the transmission 1/2 of the bell (thinking Volvo/White) then there is nothing at the rear of the transmission.

It may have something to do with how much weight is cantilevered off the back of the bell housing, esp when aluminum housing are used.  

Just an observation 

spot on with that response.;; Mack to Mack power trains the rear engine mount is on the transmission. when a "foreign transmission "is used having rear engine mounts ON the engine bellhousing< a rear support hanger is used on the transmission. as always there are exceptions to the rule . a Mack engine with rear bellhousing mounts coupled to a RR could possibly eliminate the rear hanger mount.

[mechohaulic]

7 minutes ago, Freightrain said:

I may be screwed up.  Pull clutch would wear the rear side(pulling crank towards rear).  The pilot bearing would wear front due to crank being pushed forward.

Time to relax before I get too wacked out on my thinking.

think I need another Yukon Jack BUT the pilot bearing wear would have very little to do with the push/pull clutch arrangement. clutch disc sliding on a pilot shaft SHOULD have slight wear on a bearing. that much movement on the pilot shaft would indicate another problem with transmission front bearing  ???yes/no ??

[Joey Mack]

His front crankshaft thrust bearing was damaged. So we started chatting about the forward forces on the crank that would have damaged the thrust bearing..  I even doubted myself when I knew I was right about my Boo Boo doing that job..  I guess I need another shot of Potato Juice.  🍻

[mechohaulic]

I better go back to page one "check on the damaged thrust bearing, then make a second Yukon . to have with my Chinese lo mien.  someone dumping the clutch regularly would possibly effect the crankshaft. 

[Joey Mack]

Just go back a few pages. He posted pictures

[mechohaulic]

6 hours ago, Joey Mack said:

I see the inspection cover is on top, on the trans. Where is it on the new bell housing? Just curious...

another cost cut back. early bellhousings had the bottom inspection/ grease cove also the top ribbed vent cover. excessive heat  in some bellhousings was lessened with top vent. easier/ cheaper to manufacture bellhousing without top vent