New Hampshire CMP Barn 2011- 2012 HUP Overhaul

[Phil Waterman]

Hi All

No Jason may not be Karma see http://www.mapleleafup.net/forums/sh...ghlight=freeze

Today I was out in the shop working on the Pattern 12 C60L getting it ready of our club rally starting next week. At the end of the day I looked under the HUP parked ahead of the C60L in the shop and dammed if there wasn't a puddle of antifreeze on the floor grabbed the creeper and rolled under the HUP to look for the source and it was dribbling out of the drain hole on cover pan under clutch (just as Jason had dis-cribbed),

With visions of having to pull the engine this week to look at the freeze plug. As I had mentioned the service bulletins to Jason. Anyway I removed the pan and yes there was definitely coolant in the clutch pan. But a closer look showed that it had run into the pan from the outside because of the shape of the front shield. Looking up from under the HUP I could see that the side of the engine above the starter was wet. Visions leaking head gasket, then I opened the hood and darned if there wasn't coolant on top of the valve cover ridge on the lower lip on the the drivers side. Oh maybe a thermostat housing leak, looked closer and there was coolant above the thermostat housing dripping on to the steam re-leaf tube bracket. As I watched a nice big drop formed at the hose clamp on the steam re-leaf tube.

In the morning I'll drain the coolant down below that level and replace the hose and clamps. That little bit of rubber hose is probably the only rubber hose that wasn't replaced. Hope that turns out to be the problem.

Lesson learned look for the simple cause for problem and sometimes you get lucky.

Cheers Phil

[Phil Waterman]

Hi All

Well the BEAST has been running good since it got back on the road in late July BUT it still has some very annoying teething problems. Some have been easy to find and fix BUT there is one very large annoying problem.

The clutch intermittently sticks, the random nature of this problem is what is so frustrating. Ninety percent of the time it works fine then randomly it will decide to not disengage even with the peddle fully depressed. Sometimes this happens when I'm driving and some times it will happen when the truck is parked in gear or in neutral.

I have pulled the clutch pan to see if I could see any thing obvious, No. Well Saturday was one of the clubs last Fall runs our foliage run it after adding another couple of hundred miles to the odometer and having it still stick hard every now and then, decided that it just had to come apart. So this morning I pulled the transmission and clutch assembly hoping that I would find something obviously wrong. No such luck.

Looking for ideas on what to check.

This clutch and pressure plate assembly was new before the recent overhaul (probably 5-7,000 miles) and it worked great before the overhaul.

Anybody got any ides?

Cheers Phil

[Bob Carriere]

HI Phil

Read through a few GM shop manuals....

so if I understand correctly..... with the clutch pedal fully depressed the clutch disc will not disengage......

If so... then none of the linkage adjustment or pedal bushings are to blame.....

The only thing left is the mechanics of the clutch......

GM points out worn spline on tranny shaft and /or spline socket in center of clutch.....

....possibly a misalignment between the clutch housing and the pilot bushing in the end of the crank shaft....

Did you replace the bellhousing.....dowel alignment.... from BH to engine block?

Something broken parts inside clutch pack...parts of which are moving and at times locking plate from movement.....but that usually applies to coil spring packs not the finger model...

You are running a finger type clutch right...? weak or broken fingers.....

Have you considered taking the clutch pack apart....making sure to punch locating marks before disassembly.....

Almost has to be something mechanical that keeps the disc from moving even when you have full pressure on the fingers.....

A lot has been written about clutch plates rusting on the flywheel after being parked for years..... and how to free them up.... not much found on a clutch that will rellease sometimes and sometimes not......

....you would not have a HUP clutch in there by accident..... I hear they are fussy...

Bob

[Bob Carriere]

Hi Phil

Got my newsletter today.....

So what was that gooey sticky stuff on the clutch plates??? and how did it get there....? how do you know it will not gather again...... ??

So could a full can of brake cleaner sprayed onto and into the clutch pack housing ... with the bottom cover removed..... be a roadside fix....?

On another note..... how did you fare out with the latest bad weather..?

Bob