A couple of weeks on and I have made a bit of progress between work things that needed to be done.
First up was stripping the head from the Hilux to see if I could figure out what was wrong. Out comes the Snap On valve tool:
[IMG]http://images.plebeians.net/_data/i/upload/2021/08/23/20210823050007-9ec4d87e-xl.jpg[/IMG]
This thing is a bit of magic and can be used easily for removing and installing valve collets. Just place ontop of the valve retainer (black bit is the installation tool) and hit with hammer:
[IMG]http://images.plebeians.net/_data/i/upload/2021/08/23/20210823045959-9f033d04-xl.jpg[/IMG]
A little magnet in the recess pulls out the collets and lets it pop off the valve:
[IMG]http://images.plebeians.net/_data/i/upload/2021/08/23/20210823045952-dbd961b3-xl.jpg[/IMG]
Installation is basically the reverse, will show that when the time comes.
Do that a few times—16 to be precise—and you are left with this:
[IMG]http://images.plebeians.net/_data/i/upload/2021/08/23/20210823045946-72542190-xl.jpg[/IMG]
And this:
[IMG]http://images.plebeians.net/_data/i/upload/2021/08/23/20210823045929-7c1907a6-xl.jpg[/IMG]
Everything looked reasonable at that point, so i took all the valves over to the bench grinder to wire wheel off the carbon deposits, and there i found this:
[IMG]http://images.plebeians.net/_data/i/upload/2021/08/23/20210823045906-919ce86c-xl.jpg[/IMG]
Went back to the head and cleaned up that port (Intake 4) and valve seat and presto:
[IMG]http://images.plebeians.net/_data/i/upload/2021/08/23/20210823045805-65970d47-xl.jpg[/IMG]
And a backlit comparison with the valve in the other port:
[IMG]http://images.plebeians.net/_data/i/upload/2021/08/23/20210823045732-49b4cac0-xl.jpg[/IMG]
That would be the source of low compression on the second pot. Now in a normal situation i would just get a new valve cut for the head and have it matched in with stem length. But being in lockdown makes that more difficult.
However, I do have an entire spare engine…. so onto that head. Before i pulled the valves on that head though i rebuilt my vacuum tester and checked all the ports on that one to see if there were any significant leaks:
[IMG]http://images.plebeians.net/_data/i/upload/2021/08/23/20210823033949-c272cc8f-xl.jpg[/IMG]
All tested fine at around 24inHg so that should be fine for lapping back and sealing up again.
So here we have it:
[IMG]http://images.plebeians.net/_data/i/upload/2021/08/23/20210823165522-9137d070-xl.jpg[/IMG]
Another head stripped and ready for a quick clean up and reseal.