How a "Block Style" cylinder head is measured for thickness.
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How a "Block Style" cylinder head is measured for thickness.
This is a fairly simple thing to do. This will also help in setting the timing belt and calculate combustion chamber size. New head thickness is 5.200 The Mitsubishi factory manual says a combined total of .008 may be removed from the block and head. AERA (Automotive Engine Rebuilders Association) says .015 can be milled from the head. So by AERA specs the Min thickness will be 5.185 The tools needed will be few. Something to use to clean the head gasket surface And a set of venier calipers, Paper and pen. The first thing to do is remove the head from the engine. Remove both the exhaust and intake manifolds. Now on the work bench, remove the cam caps Attachment 4685 The cams and followers. Attachment 4686 Next roll the head over so the head gasket surface is up. Attachment 4687 Now the head gasket surface needs to be cleaned of any old gasket material. Attachment 4688 I use a stiff backed long body board. Now roll the head so one port side is up, I will start on the exhaust side. Attachment 4689 Measure from the valve cover rail to the head gasket surface. I will also use the cam cap mating surface on the top, it will help keep the calipers square. Make a note of the measurement. This is Exhaust Front On this head it was 5.193 Next I will move to the rear of the head. Attachment 4690 Make note of this measurement. This is Exhaust Rear Here I measured 5.190 Next roll the head over to the Intake side. Attachment 4691 This is the Intake Front The measurement is 5.191 Now to take the forth and final measurement. This is the Intake Rear Attachment 4692 This measured 5.188 So now with the 4 measurements. EF=5.193 IF=5.191 ER=5.190 IR=5.188 We see the head is not parallel to the valve cover rail. We can see that from side to side there is .003 difference And the same .003 from front to back. Note also this head was belt surfaced before. This is not a badly surfaced head for being belt surfaced. The combustion camber volumes will still not be equal. This procedure will hold true for any "box style" cylinder head. Other related links |
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