Head removal and lapping tool question

[Mr. Y]

Hello.
I've been enjoing my Supra after turbo swap, but no so long :-( Today I was going to set ignition timing, but i could not see any marks, so I decided to paint them in white... I put wrench on crank bolt, turned it a little, painted marks... And started the car. Yes, I forgot wrench on the bolt, so bolt flew out and engine stopped. When I returned bolt on it's place, checked marks, started car - only 3 or 4 cylinders are working :-(

So, I think some of valves are twisted (they met with pistons)... Now I'm gonna to remove head...

And finally questions:
1). Now i'm using stock headgasket, and planning to use HKS 2mm (I already have it). Friend of mine, has lapping tool, so I'm going to lap block in the car.
Have anybody done that? How to prevent laping abrasive from getting in oil system and cylinders? Will be enough just insert paper or cloth there?

2). HKS bead gasket - with 86mm cylinder bores, but my engine is 84mm (stock). Is not it a problem? HKS says that their gasket can be used with nominal bores and oversized too...

3). Cauld not you give me a link, please, that help with head removal/install (I already have TSRM and supras.nl)

looking forward your answers and advices, thank you very much.

 

[lagged]

you can use the HKS gasket with stock sized bores.

and no, the valves did not get bent up by the piston.

 

[Mr. Y]

Ok, and what is the trouble? Looks like I have no compression in some cylinders.

PS: my head has been grinded, so I think valves could be bent.
And I have some noise from rear of engine when i turn it (without spark plugs) by the hand. Sounds like you hit tensioned spring with something...

PS2: new question:
What can be damaged? I'm afraid for bottom end...

 

[lagged]

depending on how much material has been removed from the head and block id guess it is possible to make the head interferance.

you did check to make sure that the crank pulley bolt is still on tight? you might have clicked it loose.

 

[Mr. Y]

Oh shit! I'm stupid... I've checked timing marks, but I didn't check crankshaft timing gear! I've just bolted harmonic balancer back. But may be it is in wrong position...
The question: in what way crankshaft timing gear is positioned relative to crankshaft? does it have pinholes and pins like camshaft gears do? Or may be in some other way?

 

[chriso]

The crankshaft pulley (harmonic balancer) can only go on one way. There is a keyway in the crankshaft. Make sure you still have this key in there or you will never be able to adjust your timing correctly. Oh and also, the crank timing pulley (the first pulley in the timing housing on the crankshaft) has a key also.

When lapping the block in place you may want to put some silicon in the bolt holes and oil passages just to cover them while lapping. The silicon is easy to remove once it hardens and you are done lapping.

You can tell if your valves are bent by checking your camshaft clearance to shims. If any are well over the recommended clearances you may have bent valves. However, the 7MGE and GTE engines have a "non-interference" valve. Which means that in no way will the pistons hit the valves in the event of a timing belt failure.

 

[Mr. Y]

Ok, I will inspect all more closely tomorrow and report here.

2 chriso: thank you for advice with silicone.