K series, chain jump

[evil_demon_01]

I have a Civic Type-R in at work and the timing chain is one tooth out on the intake cam. Has anyone seen this before?
It seems physically impossible for a chain to "jump" a tooth without damage, but I have a Civic at work which it seems this has happened to.
The car won't idle and won't hit VTEC.

Just wondering if anyone has seen this before, and the possible cause.
I am still yet to check the intake cam adjuster for being possibly seized, though that can't/shouldn't allow the chain to be out by 1 tooth due to the direct relation to the exhaust cam/crankshaft gear on the chain.
Confused as hell

[blizzard335]

I've seen a few chains jump in the K20a in the CRV/Stream.

Dont know how it happened though.

CTR, FD2R?

[texasvtak]

DIY gone wrong?

[evil_demon_01]

DIY gone wrong?

Motor hasn't been touched by anyone other than the honda assembly plant.

I did a little research, and it seems that some of the K20 high reving engines get this problem, especially if upgraded cams and valve springs are fitted.
Apparently its the tensioner that is at fault.

If I set everything at tdc the chain won't go on the intake cam gear, An if the chain is on the crank the cam is about 3/4 of a tooth out . . . Stretched chain I'm guessing.

[C91BLX7]

tensioners FTL

Push rod chains ftw

[Night Wolf]

so you need a new chain?

[evil_demon_01]

Well to be on the safe side we're replacing:
Chain, Chain guides, Tensioner, VTC Cam actuator.

What are pushrod chains?

[Night Wolf]

whats a VTC Cam actuator

[C91BLX7]

What are pushrod chains?

So simple, no tensioner

[evil_demon_01]

whats a VTC Cam actuator

Its basically an adjustable camgear, but it can be controlled by the ecu.

So simple, no tensioner

Hmmm that looks better.
And also has twin chain, and much better teeth.

[HenRoc]

Its basically an adjustable camgear, but it can be controlled by the ecu.



Hmmm that looks better.
And also has twin chain, and much better teeth.

Yeah I read about this in one of my electronic courses. It's able to Retard or Advance the timing of the motor.

Pretty neat stuff as well.

[Night Wolf]

btw take some pics of the cars you have there at work

[Boost_Lee]

Its basically an adjustable camgear, but it can be controlled by the ecu.

i believe this is only on a few of the i-vtec motors correct?

[evil_demon_01]

i believe this is only on a few of the i-vtec motors correct?

It appears the timing jump is only on the high revving K20 series, but also interestingly this motor isn't listed as "i-vtec" only vtec.
This is what caused some confusion - We don't sell the Type R Civic new in NZ, which means we don't have the manual for it.
So i had to look through 5 different shop manuals (Integra, and integra type R, Civic - which is the R series and K series engine, and Civic type R supplement only, which diddnt contain ALL the info I needed) engine's, to come to a conclusion on the initial problem which was - No VTEC and won't Idle, with a code indicating the Cams out of phase.
So realistically i'm still only Guessing what the problem/initial cause is/was.

When i reset the chain the other day the intake cam was out 3/4 of a tooth which leads me to beleive the chain is stretched but it still seems

[evil_demon_01]

I've seen a few chains jump in the K20a in the CRV/Stream.

Dont know how it happened though.

CTR, FD2R?

K20 CRV?? We get the K24 CRV. Is your model 4WD?