Hello Guest

88 samurai tranny noise

  • 7 Replies
  • 8867 Views

0 Members and 3 Guests are viewing this topic.

*

Offline mark J

  • 6
  • 0
88 samurai tranny noise
« on: September 15, 2009, 09:53:20 PM »
in neutal after started makes a grinding noise that gradually decreases after five minutes, but not completely. also goes away with clutch pedal in. what bearing? should I adjust clutch cable? Please help

Re: 88 samurai tranny noise
« Reply #1 on: September 16, 2009, 07:08:24 AM »

*

Online fordem

  • 4327
  • 170
  • Gender: Male
Re: 88 samurai tranny noise
« Reply #2 on: September 16, 2009, 09:18:29 AM »
Have you checked the transmission fluid level?

It sounds like the input shaft bearing - but check the fluid as the first step.
'98 SQ420 Grand Vitara
'05 JB420 Grand Vitara
'16 APK416 Vitara
'21 A6G415 Jimny

*

Offline zukimoo

  • 330
  • 2
  • Gender: Male
Re: 88 samurai tranny noise
« Reply #3 on: September 16, 2009, 05:06:22 PM »
if the sound goes away when you push the clutch pedal in then it's your clutch release bearing. Even a little pressure on the pedal will make the sound go away.

Drop the tranny and swap out the bearing. You're probably going to find a worn out clutch but I've swapped them out and gotten 6 months more out of the clutch. Don't leave it in there and keep driving unless you want the new clutch right away....the noise is coming from wearing out parts.

When you drop the tranny cut off about 1/4" off the back tranny mount. IF you cut this off then the tranny can drop right out and the little bit that you remove won't make it a problem. You'll probably find that the rear tranny mount is broken too so now is the time to change that. Find an upgrade for this because the stock mount is just garbage.
85 SJ413K SUA, 30" BFG muds, 512's, lockers and DOHC soon...
81 LJ80, 800cc of pure power....Stock
06 Baja Buggy

*

Online fordem

  • 4327
  • 170
  • Gender: Male
Re: 88 samurai tranny noise
« Reply #4 on: September 17, 2009, 07:56:32 AM »
if the sound goes away when you push the clutch pedal in then it's your clutch release bearing. Even a little pressure on the pedal will make the sound go away.

Actually - in my experience - if the sound goes away when you push the clutch in, the clutch release bearing is the last thing it's likely to be - assuming a properly adjusted clutch - I'll explain this later..

If the vehicle is stationary with the engine idling, when the clutch pedal is released (clutch is engaged), the transmission input shaft and depending on the transmission design the countershaft or layshaft will be rotating, the output shaft will be stationary - any one of several bearings supporting the input shaft and countershaft could be making the noise, and you may be able to pinpoint which bearing it is with surprising accuracy, by listing to the noise with the vehicle in motion and observing which gear it is loudest in.

If it is a bearing in the transmission I would suggest a transmission rebuild job and change out all of the support bearings and seals - by support bearings I mean those that support the gearshafts in the casing, rather than the needle bearings on which the gears themselves rotate.

Back to the clutch release bearing - if the clutch is properly adjusted the clutch release bearing is not rotating with the clutch pedal is released and so should not be making any grinding noises - as you depress the pedal the clutch fork pushes the bearing toward the flywheel until it comes in to contact with the fingers on the clutch plate and then depresses the fingers causing the clutch plate to lift so that the clutch disengages and the engine continues to turn, without turning the transmission input shaft.  This is the point at which the release bearing is rotating - the outer part of the bearing is in contact with the clutch plate and rotating, the inner part of the bearing is on the clutch fork and stationary - this is when a defective release bearing makes noise.

If the noise occurs only when the clutch pedal is depressed (with the engine running) that would be a defective clutch release bearing.

It's also possible for a bad pilot shaft bearing (the little one in the back of the flywheel - also known as a spigot bearing), to make a noise when the clutch pedal is depressed, but this is not as consistent as the clutch release bearing, since it will depend on which gear you're in and if the vehicle is moving - both of these affect the rotational speeds of the two parts the flyheel that the outer part of the bearing is attached to, and the pilot shaft, that the inner race of the bearing is attached to.
'98 SQ420 Grand Vitara
'05 JB420 Grand Vitara
'16 APK416 Vitara
'21 A6G415 Jimny

*

Offline Amilla

  • 1076
  • 0
  • Gender: Male
  • Toyota running gear was made for a samurai!
Re: 88 samurai tranny noise
« Reply #5 on: September 17, 2009, 10:02:52 AM »
I would say its the pilot bearing, or something related to that.  My 88 samurai used to make all sorts of nasty noises. 

Every time I have pulled a Samurai or Sidekick transmission apart I have had to deal with this.


The pilot bearings seems to seize up, so the input shaft is just wearing away.
Once the input looses its fit the shaft sags down, starting to wear the splines.
You get all sorts of goofy sounds while in neutral (could hear the noise driving)

I had the same noises you are talking about, so there is a possibly that yours could be the same way.


Amilla
88 Samurai, Sprung Up, Geared Down, Locked,With Yotas.

*

Online fordem

  • 4327
  • 170
  • Gender: Male
Re: 88 samurai tranny noise
« Reply #6 on: September 18, 2009, 09:43:11 AM »
The pilot shaft bearing - the one that caused the wear in the picture above - does absolutely nothing once the clutch pedal is released - it's rotating "as a single unit", the flywheel is turning, the clutch plate is turning at the same speed as the flywheel, and of course the pilot shaft is also turning at the same speed - the inner (pilot shaft) and outer (flywheel) races of the bearing are rotating at the same speed.

When the clutch is depressed - it's a different story - that is when the bearing' inner race is rotating relative to the outer race.

So if you're hearing the noise with the clutch pedal relased - it's NOT the pilot shaft bearing.
'98 SQ420 Grand Vitara
'05 JB420 Grand Vitara
'16 APK416 Vitara
'21 A6G415 Jimny

*

Offline mark J

  • 6
  • 0
Re: 88 samurai tranny noise
« Reply #7 on: September 21, 2009, 07:34:31 PM »
WELL, I DROVE THE SAMMY ABOUT SIX HUNDRED MILES THIS WEEK END ON A DEER HUNTING TRIP.i NOTICED ALSO THAT THAT THE TRANNY WAS LOUDER IN THIRD AND AND FIFTH GEARS. IM THINKING A TRANNY REBUILD WILL BE IN NEAR FUTURE, AFTER A COUPLE, OF NEW PROBLEMS ARE FIXED THAT AROSE ON THE TRIP. THANKS FOR ALL OF YOUR INPUT. MARK