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| Lapping plate for cleaning a cylinder block face in situ. |
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| dawesy:
Can anyone recommend anything to Lapp the face of a cylinder block in situ ( 4cyl car engine) Basically I just want to make it smooth and even before fitting a multi layer steel headgasket. These need a smooth finish. The block was decked about 15,000 miles ago but the headgasket has failed (thermostat failure) don't really want to pull the block. The head isn't a issue as I can have this skimmed if needed. Block is cast iron by the way. What is the best tool for the job. Had a look at lapping plates but they seem either too small or to big and expensive. Anything else I can use? |
| awemawson:
Sheet of plate glass and some emery paper ? It'll reveal the problems if they exist |
| dawesy:
Excellent. Don't know why I didn't think about that :) |
| BaronJ:
Hi Lee, I use a porcelain bathroom tile as both a surface plate and for lapping on. Fine abrasive cloth held down with pva (it needs some time to set) works great and washes off with hot water when you need to remove it. I did try double sided adhesive tape without to much success and its a pig to clean off. |
| Pete.:
You'll need to come up with a very good idea to prevent abrasive slurry running down your cylinder walls and getting trapped in the piston clearance and ring grooves, or you might be lapping the bore too when it's first run. I suggest plasticine around the edge piston crown for a secondary line of defence followed by a close-cut plastic disc fitted a short way down the bore with bathroom sealant or something similar. You can cut away the sealant later with a stanley/razor blade. Lap using something that is definitely not going to bend with hand pressure or you'll bow the top of the block. |
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