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Just installed a Toda TCT.
Install went well - installed TCT, removed the black retainer bolt, installed oil bolt then installed the cover.
Started the engine - yikes!
Much ugly grinding noise....
Is it possible the TCT shaft did not extend to the timing chain?
I would have expected a "click" or some such indication when I removed the black bolt, but didn't notice any...
???
I will remove the inspection cover and see if the shaft is extended...
The OEM TCT is bolt retracted if you choose to, I've seen this definition before but not sure I understand why it would matter?
Except if you do it wrong and not retract completely.
The OEM TCT comes with a lockpin, eliminating the chance of the piston extending. They can always be installed flush to the engine.
Bolt retracted TCT pistons can extend without warning, and can, and have, countless times. They can compress the chain guide, overtighten the chain, and cause instant engine damage, if the tensioner does not fit flush on it’s own.
The OEM TCT comes with a lockpin, eliminating the chance of the piston extending. They can always be installed flush to the engine.
Bolt retracted TCT pistons can extend without warning, and can, and have, countless times. They can compress the chain guide, overtighten the chain, and cause instant engine damage, if the tensioner does not fit flush on it’s own.
Right so there is no physical difference, just different installation methods.
There is a big physical difference. The internal springs/pin assembly are much bigger, with a fully compressed length longer than stock, preventing full retraction. Hence the bolt holding the internals.
Yes, the Toda TCT I installed is a bolt-retracted unit exactly like the one the picture by Windhound. Yes, the allen head bolt and nut are the retraction device.
As delivered, the pin was fully retracted.
Per Billman's comments, when I installed the TCT, the pin was definately retracted, and the TCT fit flush against the block with barely finger pressure (to get past the o-rings) to get it to fit flush,
For sure there was no gap between the TCT flange and the block before I installed the mounting bolts, as I had read previous posts warning about this.
I am sure the pin was retracted before I installed the mounting bolts and unscrewed the black allen-head bolt retaining device.
I then installed the flat-head oil bolt, then the cover.
Should have been OK.
I am headed out to remove the airbox, and the inspection plate to ensure the TCT extended, then I will remove the valve cover for inspection.
If all looks OK, I will carefully turn the engine over by hand and check the valve timing.
If that checks out, I will remove the new TCT, retract the old one and install a pin, and re-install the old one, re-assemble, cross my fingers, and turn the key.
Sound reasonable?
Last edited by SkidPad; 10-28-2020 at 06:34 AM.
Reason: clarity
I pulled the cylinder head cover and had a good look - nothing obvious.
The timing chain looks like new, no marks or galling.
I rotated the engine to TDC to check the timing.
No unusual noises of any kind when turning the crank, and the timing marks lined up perfectly.
I uninstalled the Todo TDC, inserting the retaining bolt first.
No pressure pushing the TCT out when I loosened the flange bolts.
I removed the retaining bolt on the bench and the piston extended as expected.
No marks on the piston end, everything looks good.
I think I will re-install the old TCT now and see what happens......
10-27-2020, 03:45 PM
Toda TCT
