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

[fjh]

17 hours ago, Freightrain said:

I am working on rolling in new mains.  Question for FJH or Joey:

The thrust brg on the cap side.  Should it rotate slightly?  The brg seems to have a slot machined in the bottom where it can rotate about 3/8"(width of pin) over top of the pin.  Looks machined but the pin itself is worn on that side also.  Coincidence?

Back side is not cut and only wiggles a touch on the pin(which is still round and not worn like this side).

This happens on the forward side when you don't have free pedal on the clutch ! I have a habit! I open the drivers door put my hand on the clutch pedal I then know what to expect when I go to move the truck! I also now Can Nag at to  whom ever owns the truck to adjust the dam thing for that very reason! One of my many pet peeves! 

[Joey Mack]

luv it !!  fjh

[fjh]

6 minutes ago, Joey Mack said:

luv it !!  fjh

[fjh]

21 hours ago, Geoff Weeks said:

clutch shaft higher also.

will the added height clear the body/cab?

That can be nasty too the shaft lining up with the bottom frame flange yuck

[mechohaulic]

1 hour ago, fjh said:

This happens on the forward side when you don't have free pedal on the clutch ! I have a habit! I open the drivers door put my hand on the clutch pedal I then know what to expect when I go to move the truck! I also now Can Nag at to  whom ever owns the truck to adjust the dam thing for that very reason! One of my many pet peeves! 

once again this forum proves no matter your age  or years of wrench pushing, the world of mechanics has no age limit to learning new knowledge. having replaced  ????  number of thrust washers through the years never associated the clutch free play with why one  side worn not the other.

[mechohaulic]

16 hours ago, Joey Mack said:

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.  🍻

seeing the picture , I understand the issue better. thinking "damaged" ;question how? , the picture better describes the situation as "worn" , with the front thrust bearing having a slightly wider gap allowed for it to rock back/forth wearing the bearing and steel pin.

[mowerman]

Well Mecho, I think I got you beat. I really can’t add anything to this conversation except is it too late to go get something out of that R model it took the transmission and engine out of.???

[cruiseliner64]

24 minutes ago, mechohaulic said:

once again this forum proves no matter your age  or years of wrench pushing, the world of mechanics has no age limit to learning new knowledge. having replaced  ????  number of thrust washers through the years never associated the clutch free play with why one  side worn not the other.

Fully agree with you Mecho...The stuff Iv learned and been reminded of  doing our Cruiseliner is unreal.It is another thing Iv really enjoyed about doing the work on the old gal....

Paul

[mechohaulic]

21 hours ago, Joey Mack said:

Paul.. The single leaf spring at the rear of the main box was used here as well.  Ive seen it in Ford's and Freightliner's, I think Int.'s also.  

the rear "helper spring on transmission not only depends on location of rear engine mount but also transmission being used. I removed a junk 6+2 from IH having DT466(?) installed a 8LL removed from an identical IH having same engine/bellhousing . the 8LL had the rear spring assist  both engines had motor mount on engine.