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post #1 of 15 (permalink) Old 08-02-2008, 07:53 PM Thread Starter
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tranny Q, non MB

i have a truck with a manual tranny and lately it started rolling a tad when parked on an incline in 1st gear. any idea what may be the cause of this?

thanks



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post #2 of 15 (permalink) Old 08-02-2008, 08:55 PM
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What do you call a tad?
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post #3 of 15 (permalink) Old 08-02-2008, 09:38 PM Thread Starter
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6"? i dunno... just a bit but today it moved 4-5 feet overall. it didn't move at all for a time and then it started in those small increments.



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post #4 of 15 (permalink) Old 08-02-2008, 10:33 PM
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This sounded like a typical topic on BWOT and turns out to be technical. Well, sort of technical unless that tad involved is a tranny.

Your problem is compression, or more specifically, a lack of it.

Jim
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post #5 of 15 (permalink) Old 08-02-2008, 10:35 PM
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Possible weak or worn clutch, or possible lost of compression in the engine and that could be due to an host of things

However without any information about the truck such as miles, what engine it has and other things of the like it is like very hard to say... perhaps the truck is trying to make a get away? hmmmmm like run off on its own
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post #6 of 15 (permalink) Old 08-03-2008, 12:05 AM Thread Starter
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+/-140k mi, VG30E. hmm haven't though of compression but the clutch could be it. sometimes it seems to be a bit "slow" to fully engage; it's hardly noticeable but since you mentioned it, i am thinking that's what it could be. sorry for such technical jargon here but not sure how to describe it any other way..

may do a compression test if i can find a gauge although the motor runs like a champ otherwise.

thanks guys

oh, this has been on decent inclines. the first time i noticed it happening might have been at 10-15% grade. today i parked on a steep hill.. 30-40% grade.



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post #7 of 15 (permalink) Old 08-03-2008, 02:14 AM
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Dude, the pressure plate and friction disc of your clutch assembly are not intended to be a parking brake. Oddly enough, the parking brake is.....


And on a 30 to 40% grade, if a curb is available you shouldn't even rely on the parking brake.

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post #8 of 15 (permalink) Old 08-03-2008, 06:16 AM
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I would expect you to have noticed a worn clutch prior to this symptom - such as when trying to accelerate in a lower gear. But, if the clutch is the culprit when is slips there is no lumpiness that you get when the engine is actually turning over due to compression, instead it will slide downhill smoothly.

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post #9 of 15 (permalink) Old 08-03-2008, 04:26 PM Thread Starter
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well, the e-brake has been non functioning for a long while.. but for now i'll park in reverse.

so Jim, maybe you are right as it does lurch down hill. nothing smooth about it. i'll have to investigate the compression further. dang.

thanks



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post #10 of 15 (permalink) Old 08-03-2008, 04:58 PM
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Try it in reverse. Reverse is a somewhat higher gear ratio in most transmissions and the higher ratio will give the engine compression slightly more leverage to prevent you lurching down the hill. There is a chance you might turn the engine over backwards though, if you are rolling forward. Which is not a good thing. So, only do that when you are aimed uphill. And, as someone has already noted, turn the wheels into the curb and use the curb to help secure the car on the hill. Oh yeah, I almost forgot. Fix the E-Brake. It will be tough to live down a report on CNN about your truck launching down a hill.....

Jim

Sorry, just noticed you already are "in reverse."

Last edited by JimSmith; 08-03-2008 at 05:13 PM. Reason: OOPS! I see you already are doing the reverse deal.
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