8V71 idle help

luvrbus · April 08, 2016, 01:36:05 PM

Does the pedal work at the transmission ? it could be 1 disk is is stuck or the pilot bearing is frozen.Try this build up air pressure leave the parking brake on shut the engine off shift the transmission into 4 th gear and start the engine holding the pedal down if it rust or the pilot bearing is the problem it will brake it loose. Another question is that a dry clutch or wet clutch

TheMightyQuinn · April 08, 2016, 02:44:51 PM

Quote from: luvrbus on April 08, 2016, 01:36:05 PM
Does the pedal work at the transmission ? it could be 1 disk is is stuck or the pilot bearing is frozen.Try this build up air pressure leave the parking brake on shut the engine off shift the transmission into 4 th gear and start the engine holding the pedal down if it rust or the pilot bearing is the problem it will brake it loose. Another question is that a dry clutch or wet clutch

Yeah all of the levers and such are moving at the tranny. Doesnt seem to have any super excessive play, but a bit more than an inch. Pretty sure its dry

Quote from: buswarrior on April 08, 2016, 01:29:40 PM
Did you try to get it into ANY gear?

With some of these, you couldn't readily get into 1st at a stop, slipped into 3 or 4 and then slide to 1st kept the grinding noises to a minimum.

Never took it out of gear, always slipped to first as you rolled to a stop, clutch in the whole time at the light.

Those were the days.... sure was fit...

happy coaching!
buswarrior

No she wouldnt go into any gear at all. Finally just let it grind like H E double and it finally went into second, i gave it some throttle and moved about a foot, then fought to get it into reverse. But once i got her backing up, i could get it into gears with minimal grinding. Probably just not woke up yet. This poor old bus was sitting in a field for over six years sinking about a foot in the mud. Got her moved out and onto some hard levelish ground so i can work on the air lines.
Im used to old crashbox transmissions out of 40's-50's VW's so i know a little about shifting them, but i guess the spicer is a totally different breed!

I cant thank you all enough for the tips and help on this old thing. She will be a road queen again soon!

bevans6 · April 09, 2016, 05:12:03 AM

Until you fix the clutch, instead of grinding the dog teeth inside the box and causing damage you can't fix, why not just start it in gear, clutch in? If the engine will run with it in gear and the clutch in, it's dragging not seized, so if it's warm it will start in gear with the clutch in. Please stop grinding the gears for no reason...

luvrbus · April 09, 2016, 06:27:31 AM

If it's like most GM's I come across people have filled the transmissions with 85/140 W gear lube that really helps with shifting and real good on the transmissions pumps

A GM is almost impossible to shift when filled with gear lube

buswarrior · April 09, 2016, 07:00:10 AM

Uh, luvrbus, the novice reader may not pick up on the sarcasm... where can one purchase this magical 85/140W in sufficient quantity? My local store only carries those small quart squeeze bottles, will this work well in the automatics also?

Happy coaching!
buswarrior

DoubleEagle · April 09, 2016, 09:20:52 AM

The clutch is the problem, the Spicer is innocent and holding up despite the grinding.

luvrbus · April 09, 2016, 09:37:48 AM

It's hard to say what the problem is he may have the mouse trap on a dry clutch those can be tricky to adjust for clutch performance.I would still like to know if the transmission has 50w oil or transmission grease

TheMightyQuinn · April 10, 2016, 10:20:24 AM

Quote from: bevans6 on April 09, 2016, 05:12:03 AM
Until you fix the clutch, instead of grinding the dog teeth inside the box and causing damage you can't fix, why not just start it in gear, clutch in? If the engine will run with it in gear and the clutch in, it's dragging not seized, so if it's warm it will start in gear with the clutch in. Please stop grinding the gears for no reason...

It wouldnt start in gear, any gear. The engine wouldnt even turn over. But as i said, once i was able to get it into gear, it freed up so i was able to move it around. Its working fine now. No more grinding. The plate was stuck pretty badly, but again seems to be working great now.

Quote from: luvrbus on April 09, 2016, 06:27:31 AM
If it's like most GM's I come across people have filled the transmissions with 85/140 W gear lube that really helps with shifting and real good on the transmissions pumps A GM is almost impossible to shift when filled with gear lube

Ill have to do that and try it. Its definitely going to get a full fluid flush.

Quote from: luvrbus on April 09, 2016, 09:37:48 AM
It's hard to say what the problem is he may have the mouse trap on a dry clutch those can be tricky to adjust for clutch performance.I would still like to know if the transmission has 50w oil or transmission grease

I dont know what type of lube it has in it. Probably gear oil. Ill definitely try the 85/140 mix though.

Thanks again y'all. Shes coming along now. I have all of the manuals coming hopefully next week so i can start to educate myself on this thing. Cant wait for the first test drive!

bevans6 · April 10, 2016, 10:53:50 AM

He was kidding about the 85-140 gear grease. Usually they use engine oil, or manual transmission oil, SAE 50 weight, but look in your new manual when you get it.

luvrbus · April 10, 2016, 12:01:06 PM

I was kidding the GM has a Barnes gear pump to lube the transmission I think 50w is what they use the 85/140 the Barnes will not pump.I have a Barnes pump if any of the GM people need one yours for only the shipping costs fwiw

DoubleEagle · April 10, 2016, 04:56:56 PM

I thought it was the clutch, I have been through that a few times with various vehicles. You old timers should not kid about gear grease, people new to this have enough to worry about without getting confused further. (I am in my seventies as well).