LT77 Gearbox Rattle

GreenGiant92D90 · Jun 16, 2019

This slight rattle has turned into an intermittent scream and I cannot seem to find the issue. Explanation and two videos below. At first it seemed to go away when I hit the clutch so I changed the clutch and release bearing since I had a spare kit handy. Buttoned it all up and was dismayed at the sound persisting. My thoughts are possible spigot bearing or even a rattle in the selector. However I had two mechanics take a drive with a stethoscope and they say the sound is definitely coming from the clutch housing so are pointing to the release bearing. I’m racking my brain on this for weeks now. The expertise in this community is greatly appreciated!

GreenGiant92D90 · Jun 20, 2019

Any takers?

jamesmartin · Jun 20, 2019

is it only when clutch is pressed and any other symptoms like 3rd/4th changes

GreenGiant92D90 · Jun 20, 2019

jamesmartin said:
is it only when clutch is pressed and any other symptoms like 3rd/4th changes

When out of gear - no rattle, but once she gets to 1st and starts up rattling there is really no one thing that calms her down. Pressing the clutch doesn’t cause an immediate silencing but after about 10 seconds after hitting the clutch it will stop. It isn’t all the time either. Sometimes it’s quiet and then it will slowly start rattling and then get worse, but it isn’t dependent on speed either (like it doesn’t wind up and down with speed like if a belt was going). At a constant speed it could start, get loud, then quiet down again. The videos I put up may help to answer better as well. There is nothing different about any gear - same noise in every gear.

jamesmartin · Jun 20, 2019

if pressing the clutch isnt the cause ie quiet when you lift pedal up , id drain some oil out of the box and check for fillings if its a box bearing it will fail very soon

GreenGiant92D90 · Jun 20, 2019

jamesmartin said:
if pressing the clutch isnt the cause ie quiet when you lift pedal up , id drain some oil out of the box and check for fillings if its a box bearing it will fail very soon

I was thinking if it was a bearing that it would have failed by now having driven it this way for a couple weeks now. I’ll be home from a trip tomorrow night and drain some oil Saturday to check.

Pressing the clutch does quiet it down. It just takes up to 10 seconds. It isn’t immediately quiet when pressed as if it was a release bearing. The mechanics up the street put a stethoscope to it and said it was in the clutch housing but I changed the release bearing and Clutch. Thought maybe I missed a bad spigot bearing but I’m haunted by pulling the box again to change something on a guess.

jamesmartin · Jun 20, 2019

i doubt its the spigot,stethoscope isnt the best tool for exact locating,take the box out and have a look

GreenGiant92D90 · Jun 20, 2019

jamesmartin said:
i doubt its the spigot,stethoscope isnt the best tool for exact locating,take the box out and have a look

Drain plug has about what I believe you’d expect for 200k miles and filter not showing anything indicative of a bearing torn to shreds.

LT77 Gearbox Rattle

GreenGiant92D90

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jamesmartin

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