Major timing chain mistake - need assist (1 Viewer)

Joined
Sep 7, 2002
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2
Location
Tracy CA
This is for a 2007 FJ Cruiser, but with 1GRFE it could be any Toyota so equipped. I'll start by saying this was a major bonehead move and since I was not present I have only the details I can gather from my conversation with my son. He had an issue with loud chain noise and when he removed the valve covers he saw that the passenger side tensioner may need replaced, but the main culprit was likely the main tensioner was froze up. He did not move to tdc nor lock the valvetrain before attempting his repair and in his words "the camshaft timing gear ratcheted", I am assuming that the tension on the passenger timing gear caused the chain to slip since he had the main tensioner out so now timing is hosed and with zero clearance timing this thing likely needs to be torn down and returned to spec. It has not been started. I am looking for the best way to dig into this. I am ok with removing the timing chain cover to return everything to factory, we did the timing chain replacement a couple of years ago on my v6 tacoma so I am familiar with that part of the process, but am looking for some assistance on how to proceed with this since I cannot achieve TDC without fear of valve to piston contact. Should I be removing the camshafts to relieve valve tension and then proceed? Many thanks in advance!
 
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Joined
Sep 7, 2002
Messages
2
Location
Tracy CA
Thanks fjc-man. I was a bit hesitant to pull it all apart without being TDC, or having a second opinion but since I don't know the correlated position of the camshaft in RH bank I guess I can only proceed with full camshaft removal on both sides and set to factory.
 
Joined
Mar 28, 2006
Messages
294
Location
Upstate NY
Thanks fjc-man. I was a bit hesitant to pull it all apart without being TDC, or having a second opinion but since I don't know the correlated position of the camshaft in RH bank I guess I can only proceed with full camshaft removal on both sides and set to factory.


Do it the right way by pulling the camshafts and re-indexing everything properly. Why risk the engine by taking any shortcuts that could prove to be expensive?
 

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