Jump to content
The mkiv Supra Owners Club

Head skimming and block reboring


Jake

Recommended Posts

I've been talking to a local place today about reboring the block from my VVTi and checking the head (and skimming it if necessary). The guy was asking if I was going to remove the valves myself or if I wanted him to do it. Is that really necessary? If the cams are out of the head all the valves will be closed anyway, won't they?

 

I'm hoping the head won't need skimming because I'd prefer to use a stock Toyota 1.0mm head gasket. If, because of skimming, I need a 1.2mm or 1.6mm head gasket I guess I'll have to get a HKS from the states will I? Or are there other options?

 

One more thing, where can I get all the torque settings for the engine internals? (Online preferably)

 

 

Thanks for any help.

Link to comment
Share on other sites

That's more like it! Thanks.

 

 

What about my valves question?

:D

 

Well although I can see your point on deking a head with the valves in ..Me personaly I would remove them ( have always done it this way and always will ) purely from a swarf point of view. I like to check that everything is clean and servicable when I put it back together ( lap em back in and check seats ect ect ). And seeing the possible temps yours has got to would make me do it even more so the head can be inspected all round for damage and cracks. Personal preference but I have had too much experience with machine shops now giving it "yeah it will be spot on and clean" only to find 1/2 of their machine shop around the valve springs. Also had a machine shop wreck 2 heads when his so called machine went awol and took some seats out ..lucky the valves wernt in there for that one huh!

Link to comment
Share on other sites

Yeah, I suppose you're right. It's just that I don't have the tool for removing the valve keepers (or whatever they're called). Seems like even the one Tony Licence got from SnapOn needed modification and I don't have the facilites for that kind of thing.

 

By the way:

And seeing the possible temps yours has got to would make me do it even more
I'm doing all this to my original engine - the one that detted and melted two pistons, not the one that overheated.

 

You still got those 86.5mm CP pistons and rings? I might have those off you if a 0.5mm overbore will suffice

Link to comment
Share on other sites

Yeah, I suppose you're right. It's just that I don't have the tool for removing the valve keepers (or whatever they're called). Seems like even the one Tony Licence got from SnapOn needed modding and I don't have the facilites for that kind of thing.

 

By the way: I'm doing all this to my original engine - the one that detted and melted two pistons, not the one that overheated.

 

You still got those 86.5mm CP pistons and rings? I might have those off you if a 0.5mm overbore will suffice

 

Like I say many people do get it done with the valves in and been fine .I'm just anal and do things my way the last thing you want to do is put it all back together and have a leaky valve or swarf.

 

Oh then if you are doing it to the engine that has detted and Melted 2 Pistons that's even more reason to take the valves out. It's more that certain that melted piston has covered the valves and got on the seats also. So you will need to look into that, for pitting in the seats and pick up on the valves. You may find you will be needing to replace some valves if they dont clean up .....but this is the bit where you tell me you are going to use another head so that that all out of the window LOL.

 

As for the tool that Tony used ..you wont need that tool if you have the head on the bench. A good old fashioned valve clamp will work just as well and they are cheap as chips and you can throw some new stem seals while your at it if you want. The tool Tony used is brilliant for head on work and works well head off also but a clamp will do the same job.

 

Yes the CP are still here sitting fo a home to go too along with lots of other stuff. Need it all gone sob sob.

 

Anyway ..have fun and good luck.

Link to comment
Share on other sites

Oh then if you are doing it to the engine that has detted and Melted 2 Pistons that's even more reason to take the valves out. It's more that certain that melted piston has covered the valves and got on the seats also. So you will need to look into that, for pitting in the seats and pick up on the valves. You may find you will be needing to replace some valves if they dont clean up .....but this is the bit where you tell me you are going to use another head so that that all out of the window LOL.
Ah bugger! :banghead:

:D

 

I hadn't thought of that. Perhaps I better give them both the cylinder heads and see which is the best.

Anyway ..have fun and good luck.
Thanks, I will. I like doing this kind of thing - shame I don't know what the hell I'm doing! :D

Hopefully with you guys help I'll get there in the end.

Link to comment
Share on other sites

Ah bugger! :banghead:

:D

 

I hadn't thought of that. Perhaps I better give them both the cylinder heads and see which is the best.

Thanks, I will. I like doing this kind of thing - shame I don't know what the hell I'm doing! :D

Hopefully with you guys help I'll get there in the end.

 

Well 2 heads and 48 valves I'm sure you got something that is workable. And 2 blocks also ...just choose the best and you will be fine. And hopefully the bores are not that bad. IF and only IF you have a block that has escaped damage I also have a brand new set of stock rods and pistons from a rebuild I done for a BBS member. So you have pretty much all bases covered piston and head wise I think.

 

It will be fine .:thumbs:

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. You might also be interested in our Guidelines, Privacy Policy and Terms of Use.