Bent Valve After Timing Belt Replacement / VVTi Engine (6 Viewers)

[Snow Wagon]

Hello Forum,
Looking for a little advice...
A guy reached out to me about working on his 2007 100 Series Land Cruiser w/ a bent valve.
Another shop just did the timing belt / water pump job and when they started it post job a valve (or valves...) was bent.
The other shop indicted that the issue was unrelated to the tb / wp job (very unlikely...).
The other shop is owned by a friend of his, so he's not pushing the issue.

I've done a lot of work on the 100 Series, including multiple timing belts.
From what I've read, the non-VVTi typically doesn't damage valves when a timing belt brakes.
Therefore, I would assume that a non-VVTi would not damage valves if a timing belt was installed incorrectly.

But, this is a VVTi motor.
If the timing belt was installed incorrectly, would it damage valves?
If so, how bad should I expect it to be?
Engine replacement time?
Pull heads and just replace some bent valves (and anything else damaged...)?
The motor has 230k on it and ran well prior to the tb / wp job (per the owner...).

Thank you in advance for your responses.
Tom

 

[vipergrhd]

Let's just forget the part that this was installed wrong, damaged is done. From my own personal experience, get the timing belt installed correctly I would do a leak down test on all cylinders I'm sure you will find right away how many cylinders are not building any pressure. If you are lucky enough you might have damaged on one cylinder head (bent valves) I have sent out a head and just replace the damaged valves no machine work no valve job just repair that is if you are on a budget. The proper way would be doing both heads with complete valve job and minimal surfacing, pistons could live with small indentations from the valves.

 

[Scotty UZJ100]

The VVTI 2UZ is an interference motor so if it isn't timed properly you will have valve to piston contact. So both valve and piston would have been damaged. You could probably bore scope it to find the marked up piston and go from there.

 

[excessive]

about 13 mins into this video, might explain what happened

 

[nissanh]

non-vvti is non interference.

 

[Snow Wagon]

Thank you for the responses so far.
Yes, it is my understanding that the VVTi engine (2006 & 2007) is truly an interference engine, where as the non-VVTi engine (1998 to 2005) is not really an interference engine (even though Toyota says it is...).

Anyone have real world experience as to how much damage is likely done?
I'm trying to give the owner an idea of what to expect.

Thank you.
Tom

 

[Trunk Monkey]

There's a couple threads out there on people that have had a VVTi engine timing belt break, think they've mostly ended up in engine replacement. Some of it depends on how quickly it was caught and how long it ran with the valves hitting the pistons. As was mentioned, bore scop and leak down will tell you a lot for next steps.

 

[nissanh]

Sorry, it happened to you. LIke Trunk Monkey stated, inspect the damaged valves, pull the head on that side and get new valves, new OEM gasket and call it done. Install an OEM toyota belt (not a belt that just say mitsuboshi) OEM toyota belt will have TOYOTA on it.