TCT DIY - Replacement or repair
#11
Moderator
Very nice.
If you'd like to add an extremely easy way to get the tct out once the 2 bolts are removed, simply pry on it THROUGH the maintenence hole. Takes 0 effort
If you'd like to add an extremely easy way to get the tct out once the 2 bolts are removed, simply pry on it THROUGH the maintenence hole. Takes 0 effort
#14
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Its a very detailed DIY
But..
Saki GT Posted on Aug 9 2010, 05:51 AM
There is IMO only 1 way for a TCT to go bad - the main piston stays in and it does not come out under oil pressure to remove the slack from the chain.
Without knowing why that piston stays in, keeping in mind there is nothing making it stay in, I would not change anything in a TCT.
The worm is IMO more like a ty-rap, it only allows movement one way once the oil pressure is gone, with oil pressure it floats to allow slack compensation when the engine warms up (the differences of expansion between alu block/head and steel chain/sprockets.)
Oh well...
But..
Saki GT Posted on Aug 9 2010, 05:51 AM
I think billman once stated that the TCT operates using an oil hydrolock, spring tension, and oil pressure, so three possible ways for a TCT to go bad, but the most common seems to be oil hydrolock failure as the worm gear and piston become too smooth to "catch" the oil - like a stone in a river it wears smooth with time.
Without knowing why that piston stays in, keeping in mind there is nothing making it stay in, I would not change anything in a TCT.
The worm is IMO more like a ty-rap, it only allows movement one way once the oil pressure is gone, with oil pressure it floats to allow slack compensation when the engine warms up (the differences of expansion between alu block/head and steel chain/sprockets.)
Oh well...
#15
Originally Posted by SpitfireS,Aug 9 2010, 09:57 PM
Its a very detailed DIY
But..
Saki GT Posted on Aug 9 2010, 05:51 AM
There is IMO only 1 way for a TCT to go bad - the main piston stays in and it does not come out under oil pressure to remove the slack from the chain.
Without knowing why that piston stays in, keeping in mind there is nothing making it stay in, I would not change anything in a TCT.
The worm is IMO more like a ty-rap, it only allows movement one way once the oil pressure is gone, with oil pressure it floats to allow slack compensation when the engine warms up (the differences of expansion between alu block/head and steel chain/sprockets.)
Oh well...
But..
Saki GT Posted on Aug 9 2010, 05:51 AM
There is IMO only 1 way for a TCT to go bad - the main piston stays in and it does not come out under oil pressure to remove the slack from the chain.
Without knowing why that piston stays in, keeping in mind there is nothing making it stay in, I would not change anything in a TCT.
The worm is IMO more like a ty-rap, it only allows movement one way once the oil pressure is gone, with oil pressure it floats to allow slack compensation when the engine warms up (the differences of expansion between alu block/head and steel chain/sprockets.)
Oh well...
#16
Moderator
The piston is retracting because of lack of traction/surface area contact with the worm gear.
Take a look at the worm gear of a bad TCT. You'll see that only 25% or less is contacting the piston.
Hence why sandblasting fixes it.
Take a look at the worm gear of a bad TCT. You'll see that only 25% or less is contacting the piston.
Hence why sandblasting fixes it.
#18
Originally Posted by Saki GT,Aug 9 2010, 05:43 AM
Here is a photo of an old and new TCT (upside down though) - the new one has the pin in place to hold the piston back:
- the pin is part 13.
david1 states:
- the pin is part 13.
david1 states:
So if we have te remove this pin using the maintenance hole, why don't we remove the pin before inserting the new TCT in its place? It would be easier wouldn't it?
#19
Moderator
Originally Posted by Bingoig11,Aug 11 2010, 09:58 AM
why don't we remove the pin before inserting the new TCT in its place?
THAT is why
#20
Just out of curiosity, when the tct is installed in the engine, where does the piston sit in relation to the timing chain? just wondering if the TC is behind or in front of the piston, acting like a guide of some sorts. not sure if that makes any sense.
I'm just curious because if, i mean "when" i have to replace it, i want to know where that piston goes when i remove that pin lol.
I don't have that tct noise yet. As far as I know, its still the original with about 30K miles now, still using dino oil.
I'm just curious because if, i mean "when" i have to replace it, i want to know where that piston goes when i remove that pin lol.
I don't have that tct noise yet. As far as I know, its still the original with about 30K miles now, still using dino oil.