Head Replacement
Thread Starter
10th Gear
Joined: May 2023
Posts: 10
Likes: 2
From: Hawaii
Head Replacement
I tried to search for an answer to this question to no avail. I screwed up installing a replacement timing belt on my 06 400h, and most likely damaged some valves. Engine makes lots of clanking noises and it does not rotate by hand freely. Anyway, blah blah. Has anyone removed and reinstalled the heads on this engine while in the car? Utube doesn't show anything. Really the question is how difficult is it to remove and reinstall the head on the rear bank. Any assistance on this would be greatly appreciated. I will be doing a valve clearance/inspection first.
Lexus Champion
Joined: Apr 2019
Posts: 11,346
Likes: 1,624
From: FL
I tried to search for an answer to this question to no avail. I screwed up installing a replacement timing belt on my 06 400h, and most likely damaged some valves. Engine makes lots of clanking noises and it does not rotate by hand freely. Anyway, blah blah. Has anyone removed and reinstalled the heads on this engine while in the car? Utube doesn't show anything. Really the question is how difficult is it to remove and reinstall the head on the rear bank. Any assistance on this would be greatly appreciated. I will be doing a valve clearance/inspection first.
Reason I ask is because maybe the bad valves caused the belt to fail(jammed valve).
Or maybe not because we don't know yet. 😁
Thread Starter
10th Gear
Joined: May 2023
Posts: 10
Likes: 2
From: Hawaii
No this is on me...I love this car and was doing some maintenance to add longevity. Engine mounts, plugs, VC gaskets, coils. Now I have a great car with most likely bent valves. I've done several belts over the years, but this one bit me.
Pole Position
Joined: Dec 2019
Posts: 2,997
Likes: 610
From: The Jet City
I tried to search for an answer to this question to no avail. I screwed up installing a replacement timing belt on my 06 400h, and most likely damaged some valves. Engine makes lots of clanking noises and it does not rotate by hand freely. Anyway, blah blah. Has anyone removed and reinstalled the heads on this engine while in the car? Utube doesn't show anything. Really the question is how difficult is it to remove and reinstall the head on the rear bank. Any assistance on this would be greatly appreciated. I will be doing a valve clearance/inspection first.
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Thread Starter
10th Gear
Joined: May 2023
Posts: 10
Likes: 2
From: Hawaii
Thanks for all the replies. I figured it would be a back breaker to do the rear head, but can it be done at all? Has anyone here performed this operation? I'm not really in a great hurry, and if I do a valve clearance on both the heads I may have a good idea of the damages. Also renting or borrowing a bore scope to look in the combustion chambers for piston damage. At this point this has become a long term project and experiment.
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Pole Position
Joined: Dec 2019
Posts: 2,997
Likes: 610
From: The Jet City
Thanks for all the replies. I figured it would be a back breaker to do the rear head, but can it be done at all? Has anyone here performed this operation? I'm not really in a great hurry, and if I do a valve clearance on both the heads I may have a good idea of the damages. Also renting or borrowing a bore scope to look in the combustion chambers for piston damage. At this point this has become a long term project and experiment.
Lexus Champion
Joined: Apr 2019
Posts: 11,346
Likes: 1,624
From: FL
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