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Old 11-25-2020, 09:53 AM   #1
PFDSA
 
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Default Problems downshifting

Hello everybody.

Recently started having problems with my manual transmission. When I stop the truck, have problems shifting into 1st or reverse. If I shake the shift around a bit, it eventually goes into shift.

While in motion, have no problem shifting up, but have a hard time downshifting into 3rd,2nd and 1st, sometimes it grinds a bit.

In addition, the pedal is starting to squeak really loud when pressed, and sometimes there's a rattling sound when in neutral. The sound goes away when I fully press the clutch.

Will get the clutch disc and pressure plate replaced as soon as possible, but should I be worried about anything else? Synchronizers?

It's a 1988 4WD Double cab D21 (PMD21) TD23 2.4 Diesel

EDIT: Bled the Master Cylinder fluid with brake fluid DOT 3 until it became clear, since the old one was complete black, but didn't notice any changes.

Last edited by PFDSA; 11-26-2020 at 09:10 AM.
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Old 11-25-2020, 10:25 AM   #2
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I would suggest the throwout bearing be replaced, and the fork that moves it checked. Your truck has a hydraulic master and slave cylinder?
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Old 11-25-2020, 10:55 AM   #3
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Quote:
Originally Posted by nunya View Post
I would suggest the throwout bearing be replaced, and the fork that moves it checked. Your truck has a hydraulic master and slave cylinder?
Thank you for the suggestion!
I'm a complete noob...any idea on how I check if it has a hydraulic master and slave cylinder?
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Old 11-25-2020, 11:22 AM   #4
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Quote:
Originally Posted by nunya View Post
I would suggest the throwout bearing be replaced, and the fork that moves it checked. Your truck has a hydraulic master and slave cylinder?
Just checked the list parts for this model and it lists in japanese a part called "clutch operating cylinder/ clutch release cylinder", could it be the slave cylinder?
This is the photo of the part
clutch operating cylinder


clutch release cylinder

Last edited by PFDSA; 11-25-2020 at 11:38 AM.
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Old 11-25-2020, 06:51 PM   #5
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Yes, that would be the "slave" cylinder.
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Old 11-25-2020, 07:32 PM   #6
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bleed the slave. this is a classic sign of air in the line. when in motion the rotating speed of the input shaft vs gears kinda matters less. they kinda natrually synch. at a stop one is in motion and the other is stationary so you kinda need that full-clutch-engagement.
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Old 11-25-2020, 08:07 PM   #7
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First thing I'd check is the tranny fluid level. Top that off to the fill hole at least with real GL4 fluid. And I hope this doesn't turn into another long discussion on GL4 fluid. haha. There are lots of threads on here about that.
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Old 11-25-2020, 08:36 PM   #8
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If your truck has the clutch damper, that may be the source of the problem as well. The damper is located on the firewall. Mine was very leaky when I first got the truck and caused a lot of problems with the clutch. I eliminated it (as quite a few people here have done) then flushed the lines and replaced the master and slave cylinder. Makes a huge difference in clutch feel.
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Old 11-25-2020, 09:19 PM   #9
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Quote:
Originally Posted by rockcrawls View Post
First thing I'd check is the tranny fluid level. Top that off to the fill hole at least with real GL4 fluid. And I hope this doesn't turn into another long discussion on GL4 fluid. haha. There are lots of threads on here about that.

GL4. Always GL4. Thou must always use GL4 and GL4 is what thou shall use!





I'd check the bleed. Noise could be a throwout bearing. If you go through the effort of replacing that just do the clutch and inspect the flywheel since you'll be there anyways. I have had vehicles that the fingers on the pressure plate rattle. My dirt bike has an automotive style clutch (2002 Gas Gas 280Pro) and it rattles like a tin can of marbles in neutral. It's the fingers flopping around.



Maybe an input bearing on the tranny? Throwout bearings generally make noise when used so when the pedal is depressed vs when the pedal is out like yours.





PFDSA, I'm not sure if English is your native language as your location says Japan but your English is really good!
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Old 11-25-2020, 09:57 PM   #10
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Quote:
Originally Posted by OldGreyBeast View Post
If your truck has the clutch damper, that may be the source of the problem as well. The damper is located on the firewall. Mine was very leaky when I first got the truck and caused a lot of problems with the clutch. I eliminated it (as quite a few people here have done) then flushed the lines and replaced the master and slave cylinder. Makes a huge difference in clutch feel.
Will definitely try that out!
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