 Could hot tranz oil change shifting? |
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| malcolm2 |
 May 22 2019, 08:54 PM
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#1
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Advanced Member  Group: Members Posts: 2,745 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States 
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90* air temp on drive home. Spent 40 minutes at 70 mph, 3400 rpm. All systems normal.
CHT 350 OP 35 OT 220 230 at re-start Oil is brad penn 20 w 50 Tranz oil is 80w90 I stopped at the post office for 5 minutes. Upon re-start the tranz did some ruffer than ever seen grinding going into reverse. Has not done that in a long time for any reason. I just had the tranz out. Replaced throwout bearing, clutch cable, clutchpedal shaft bushing. All had been well til this extra semi-hot drive. Re-pedalled to make sure i had the clutch fully down and i did. Wonder what caused it. |
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Replies(1 - 5)
| Chi-town |
May 22 2019, 09:40 PM
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#2
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Senior Member Group: Members Posts: 850 Joined: 31-August 18 From: Disneyland Member No.: 22,446 Region Association: Southern California |
Hot gear lube and a hot clutch can both cause shifting issues
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| ChrisFoley |
May 23 2019, 05:37 AM
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#3
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I am Tangerine Racing Group: Members Posts: 7,925 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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That sounds more like a need for clutch cable adjustment.
There's no synchro on reverse so proper adjustment is more critical than with the other gears. When the oil gets hot enough to cause problems, they are more substantial than a little grind going into reverse. |
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| Mark Henry |
May 23 2019, 06:54 AM
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#4
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE(ChrisFoley @ May 23 2019, 07:37 AM)  That sounds more like a need for clutch cable adjustment. There's no synchro on reverse so proper adjustment is more critical than with the other gears. When the oil gets hot enough to cause problems, they are more substantial than a little grind going into reverse. Agree also look at the linkage, a hot engine distorts things like the mounts, etc. sightly, but enough to move the linkage a hair out of alignment. Try adjusting the linkage hot. Make sure the shifter adjustment is good. Worn rubber mounts also does this. |
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| malcolm2 |
May 24 2019, 12:45 PM
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#5
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Advanced Member Group: Members Posts: 2,745 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States
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QUOTE(Mark Henry @ May 23 2019, 07:54 AM) QUOTE(ChrisFoley @ May 23 2019, 07:37 AM) That sounds more like a need for clutch cable adjustment. There's no synchro on reverse so proper adjustment is more critical than with the other gears. When the oil gets hot enough to cause problems, they are more substantial than a little grind going into reverse. Agree also look at the linkage, a hot engine distorts things like the mounts, etc. sightly, but enough to move the linkage a hair out of alignment. Try adjusting the linkage hot. Make sure the shifter adjustment is good. Worn rubber mounts also does this. Hot Adjustment sounds like the way to go. At lunch today, OT got up to 220. all else is fine. Same deal, super grinding in R. Had to turn the car off, shift to R, start car and back up..... I think I will do the hot cable adjustment after work today. Thanks. |
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| malcolm2 |
May 25 2019, 09:40 AM
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#6
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Advanced Member Group: Members Posts: 2,745 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States
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Well Happy Hour kept me from car work yesterday..... But this morning, I made a run for some coffee and warmed up the oil to 200*F. Even at 200 I could feel and hear a bit of grinding going into R.
So once home, checked the pedal play, then adjusted the cable nut. 1-1/2 turns. Still good clutch play and took it for a drive. OT still at 200 and I had smooth reverse shifting and a bit easier 1st shifting. Thanks for the tip. I think we are on to something. UPDATE: OT hit 230 in the stop and go traffic on the way home from work. Air temp was 93*F. Shifting went great. |
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