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#1 |
Registered User
Join Date: Apr 2016
Location: Puyallup WA
Posts: 48
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Getting Into Gear vs Clutch Slipping
I have been trying to figure out the right spot for my clutch to be adjusted to. I have 350 mated to SM465 and out through the NP205.
It's been hard to get into R unless it's turned off. Today I adjusted the clutch to where it will go into gear. When I test drove it and hit the gas, the clutch slips like crazy! I doubt I could go up any sort of incline. What is the next step? I was thinking clutch but it's been fine until recently. It hasn't been slipping and I haven't burnt it up. Could it be the first gear/reverse syncros? Any advice on my next step would be great!!! Thank you! |
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#2 |
Registered User
Join Date: Jun 2013
Location: Somewhere
Posts: 3,151
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Re: Getting Into Gear vs Clutch Slipping
If it won't go into whatever the clutch isn't releasing.
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#3 |
Registered User
Join Date: Apr 2016
Location: Puyallup WA
Posts: 48
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Re: Getting Into Gear vs Clutch Slipping
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#4 |
Registered User
Join Date: Dec 2009
Location: El Dorado Ca
Posts: 3,374
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Re: Getting Into Gear vs Clutch Slipping
reverse gear has no synchros, i know 1st gear doesn't either...you need to adjust your clutch so you have just a little free play in your pedal before it starts to disengage the clutch...google clutch adjustment....I have a sm465 in my trucks also, sometimes you have to double clutch to get it into reverse
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#5 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,622
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Re: Getting Into Gear vs Clutch Slipping
Did you replace the clutch, pressure plate, resurface the flywheel. R+R the throw-out bearing? Sometimes the wrong new T/O bearing will interfere.
__________________
Every 25 years I like to rebuild that 292, whether it needs it or not. |
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#6 | |
Registered User
Join Date: Apr 2016
Location: Puyallup WA
Posts: 48
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Re: Getting Into Gear vs Clutch Slipping
Quote:
In the past it was easy to get into R. I've never really used 1st(granny low) so don't know if it goes easy or not. |
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#7 | |
Registered User
Join Date: Apr 2016
Location: Puyallup WA
Posts: 48
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Re: Getting Into Gear vs Clutch Slipping
Quote:
I haven't had to do that previously, 6 months ago. It's like something is slowly getting worse. -?- |
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#8 |
Registered User
Join Date: Apr 2016
Location: Puyallup WA
Posts: 48
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Re: Getting Into Gear vs Clutch Slipping
I'm making a list of "could be's". Could be:
-warped clutch -Leaking input shaft seal -throw out bearing -power shaft bearing -syncros (from neighbor transmission guy: First and reverse are the same gear. It slides either direction depending on which direction you want to go. If you have to adjust the clutch to tight that it slips just so the tranny doesn't grind you either need a new power shaft bearing or first gear syncros. I don't think it's the bearing because they get noisy when they go bad. Either way when you tear it down both get changed.) The dumb 'ol truck has a hydraulic clutch conversion installed. I've put only a few 100 miles on it in less than year and when I got it, it worked fine. There are no new noises, just the grinding try-to-get-in-gear noise until I adjusted clutch slave until it stopped... ![]() |
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#9 | |
Registered User
Join Date: Nov 2014
Location: Bigfork, Montana
Posts: 1,137
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Re: Getting Into Gear vs Clutch Slipping
Quote:
on you list: 1. forget the warped clutch, not an issue here 2. input shaft seal - not your problem. It is easy to check - pull the dust cover off of the bottom of the flywheel & look for oil. This will cause a clutch to slip but will NOT keep it from disengaging when you push in the pedal. 3. throw out bearing - will be very noisy when bad. With the original manual adjustment you can still get enough adjustment for the clutch to work properly even with a bad throw out bearing. With your hydraulic system - don't know. I have seen bearings come completely apart & the inner race slips inside the pressure plate. You can visually check this also with the dust cover off. 4. I have no idea what a power shaft bearing is but is is not part of this transmission 5. synchros - not your issue. No synchros for 1st or reverse, chances of all the others going bad at the same time are slim Last edited by B. W.; 02-12-2017 at 12:47 PM. |
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#10 | |
Registered User
Join Date: Apr 2016
Location: Puyallup WA
Posts: 48
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Re: Getting Into Gear vs Clutch Slipping
Quote:
Today I adjusted it out so it would go into 3 and 4-hard to get into R but with lots of pressure it would go. Test drove, STILL slips. Here's a pic of pressure plate. Not sure but I think it looks ok? |
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#11 |
Registered User
Join Date: Nov 2014
Location: Bigfork, Montana
Posts: 1,137
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Re: Getting Into Gear vs Clutch Slipping
You should only have a little play at the top of the pedal before you feel the pedal begin to depress the clutch. (3/4 to 1" according to service manual) I think you have the clutch adjusted too tight so that it is already pressing against the pressure plate. If it's pushing against the pressure plate with your foot off of the pedal then the clutch will always slip because it is not engaging completely.
You are having to adjust it this tight because you cannot get enough "throw" to depress the fingers on the pressure plate to fully release the clutch & allow for easy shifts ("throw" is how much the release bearing moves against the pressure plate). You don't have enough throw because there is air in the system. You can have someone press & release the clutch pedal while you look at the release bearing. It should release completely off of the pressure plate fingers. You don't need a lot of clearance, just a very little but you do need clearance for the clutch to engage completely. It can be very difficult to remove all of the air from hydraulic clutch systems. I have fought them for years, I've even made up a few new curse words along the way! |
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#12 | |
Registered User
Join Date: Apr 2016
Location: Puyallup WA
Posts: 48
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Re: Getting Into Gear vs Clutch Slipping
Quote:
It does seem like I'm not getting the full throw of the piston. |
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#13 |
Registered User
Join Date: Apr 2016
Location: Puyallup WA
Posts: 48
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Re: Getting Into Gear vs Clutch Slipping
How do you know if master cylinder needs a rebuild kit or just needs to be replaced?
I'm wondering if I'm not getting the full throw of the pedal because the master cylinder needs to be replaced? It's not leaking but could the fluid not get forced into hyd line to pull the slave cylinder the proper distance? I'm 90% sure there isn't air in the system. The pedal is hard the full stroke, not squishy like typical air in the line. |
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#14 |
Registered User
Join Date: May 2016
Location: Henderson NC
Posts: 975
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Re: Getting Into Gear vs Clutch Slipping
Have you checked the oil level in your trans? Low gear oil will make it hard to go in reverse. Not sure exactly why but the oil slows the gear down or something like that.
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#15 |
Registered User
Join Date: Apr 2016
Location: Puyallup WA
Posts: 48
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Re: Getting Into Gear vs Clutch Slipping
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