SailLaser
New Member
Hello all, brand new to the forum.
2011 LR4 with ~140k miles. No timing codes but decided to do the preventative timing chain and guide replacement. All was going well but I’ve hit a snag.
Followed shop manual to a T to reassemble new guides, tensioners, VVTs, and chains. I was pretty sure I timed it correctly. Next came the instruction to check the timing work. Inserted old crank bolt with a washer and started turning. But I hit a couple of stops going through the two rotations. I can’t say it was a metal hitting metal stoppage, but since there is a chain connecting things, it might have made it feel a little cushy. I eventually got it through the two turns by being able to go backwards a few degrees and progressing forward quickly (some stoppages taking many, many tries to get through). At two turns, cam locks did in fact slide back in nicely.
Second guessing myself, I tore everything back apart and reassembled. Removed spark plugs. Started turning, but same situation. Distraught, I bought a borescope, and in fact regained some confidence knowing that at least at the first two stoppages, valves are not hitting pistons.
Is there anything else one can think of that would cause this sort of stoppage? Having ruled out valves hitting pistons, my next idea was bent valves, but there doesn’t appear to be visual damage from the top of the head. Damage to piston heads is more mysterious as I learned yesterday that the pistons have little indentations where the valves are anyway.
Next inquiry is whether the pumps, oil and fuel, driven by the bottom chain could be causing resistance. I found the chain to be quite slack on the static guide side, but the tension guide still had some travel in the spring. I know there is allegedly a timing mark on that chain, but don’t see how a specific timing offset could cause any problems with gears that just turn pumps.
Any help or ideas are greatly appreciated. Thanks so much.
2011 LR4 with ~140k miles. No timing codes but decided to do the preventative timing chain and guide replacement. All was going well but I’ve hit a snag.
Followed shop manual to a T to reassemble new guides, tensioners, VVTs, and chains. I was pretty sure I timed it correctly. Next came the instruction to check the timing work. Inserted old crank bolt with a washer and started turning. But I hit a couple of stops going through the two rotations. I can’t say it was a metal hitting metal stoppage, but since there is a chain connecting things, it might have made it feel a little cushy. I eventually got it through the two turns by being able to go backwards a few degrees and progressing forward quickly (some stoppages taking many, many tries to get through). At two turns, cam locks did in fact slide back in nicely.
Second guessing myself, I tore everything back apart and reassembled. Removed spark plugs. Started turning, but same situation. Distraught, I bought a borescope, and in fact regained some confidence knowing that at least at the first two stoppages, valves are not hitting pistons.
Is there anything else one can think of that would cause this sort of stoppage? Having ruled out valves hitting pistons, my next idea was bent valves, but there doesn’t appear to be visual damage from the top of the head. Damage to piston heads is more mysterious as I learned yesterday that the pistons have little indentations where the valves are anyway.
Next inquiry is whether the pumps, oil and fuel, driven by the bottom chain could be causing resistance. I found the chain to be quite slack on the static guide side, but the tension guide still had some travel in the spring. I know there is allegedly a timing mark on that chain, but don’t see how a specific timing offset could cause any problems with gears that just turn pumps.
Any help or ideas are greatly appreciated. Thanks so much.
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