Big Jay
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| posted on 1/9/06 at 09:55 PM |
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Transmission tunnel knocking
Went out for a blast today and really put my foot down for the first time. Whilst in second I accelerated hard around a roundabout and then some more
on the exit. This is when the knocking/ banging happened. About 3 or 4 loud bangs but stopped as I staightened out. Can this happen when you drive
hard like that? Has anybody else experienced it? What caused it?? I have an Indy with pinto and LSD by the way. Hope somebody can help (and tell me
nothing to worry about!!) Cheers
[Edited on 1/9/06 by Big Jay]
[Edited on 1/9/06 by Big Jay]
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caber
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| posted on 1/9/06 at 10:18 PM |
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open up the tranny tunnel and look for the shiney bits! Could be prop shaft uni joint hitting the chassis if you have enough movement in your bushes
on the back axle, also check for loose tools hiding somewhere!
Caber
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Aboardman
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| posted on 1/9/06 at 11:07 PM |
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i have come across the same problem on my super 6 with a LSD and cannot find what is causing it
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indykid
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| posted on 1/9/06 at 11:46 PM |
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if it's in an indy, i'd say first port of call would be the alternator fan. i thought the prop was knocking for ages on my old one until i
realised it was the fan on my rascal alternator.
however, after accident damage, and a strip down, there was a lot of shiny metal on the tubes round the front uj on the prop. a westfield gearbox
mount, and some fettling of the sierra bracket should sort that one out. (it could have been the fact that the gearbox was sat against the passenger
footwell, but the damage looked more like a regular chaffing than one off accident damage)
while shortening the fan belt sorted the knock on left hander drifting, it would appear the prop still managed to contact the tunnel tubes. check
both, and then draw conclusions.
tom
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stevebubs
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| posted on 2/9/06 at 12:06 AM |
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gearbox moving on mount?
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rusty nuts
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| posted on 2/9/06 at 06:43 AM |
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Had a similar problem on my Luego, fitted a Westfield gearbox mount which has cured it. Mount is not astraight forward fit , had to make an adaptor
plate to fit to chassis which lowered the rear of the box very slightly giving better clearance to my remote
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john_p_b
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| posted on 2/9/06 at 01:21 PM |
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sounds exactly what mine was doing. mine was down to stupidity of having the gearbox mount bolt fall out but i've heard of ppl having excessive
movement cause exactly the same problem.
if it's not closed in at the bottom then get underneath see if you can pull it around, if you can move it by hand then think what will happen as
you're giving it full throttle combined with chassis twist etc.
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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donut
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| posted on 7/9/06 at 06:37 AM |
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Seeing as i built the car!!!!
It's the end of the gearbox banging on the chassis. It happens due to the Indy tranny tunnel being very narrow and the sierra gearbox mount
having a rubbery mount with lots of give. Usually the cure is to either stick some hard rubber on the chassis where it hits or replace the gearbox
mount with one from Westfield............. Or drive like a girl!! 
Andy
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
http://www.flickr.com/photos/andywest1/
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David Jenkins
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| posted on 7/9/06 at 07:46 AM |
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Is it a Sierra mount? If so, do you have the bell-shaped washer thingy under it?
The bell-shaped washer is meant to stop the rubber moving around too much.
David
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Marcus
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| posted on 7/9/06 at 12:01 PM |
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I ended up modifying the chassis so the prop yoke misses the chassis!
My gearbox mount was (is) very soft, so on acceleration, going round a left hand bend, the prop hit the first upright in the tunnel. Was worse 2 up so
the embarrasment doubled!
Marcus
Because kits are for girls!!
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Peteff
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| posted on 7/9/06 at 12:56 PM |
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Get a big repair washer or two under the head of the bolt inside the bell, it makes it a lot more solid.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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coozer
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| posted on 7/9/06 at 05:07 PM |
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Had teh same problem on my Striker. Rear axle moving over under the forces generated when cornering and the diff flange was touching the tran tunnel
side.
Only happened to me when I had a passenger. It was the rubbers in the panhard rod being too 'forgiving'
Rod ends on the panhard rod, ends!
Steve
1972 V8 Jago
1980 Z750
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