Post by pishta68 on Sept 30, 2015 18:28:04 GMT -8
I posted this before on FCC but I thought it would be a good topic to share.
If you have an MA 2.0 or VC 1.8 Jap motor that shares the same head, be aware that there is an "oil control plug" in the block that socket is drilled into the head with a step, ie, it is NOT a straight hole, there is interference in it if you shave the head. They sell a .010 head shim for this reason. If you shave the head more than .010, the head gasket will NOT seal as this oil control plug (that looks like a little hollow dowel on the block) will hang up the head, possibly cracking the head if you torque it down trying to seal the gasket. You need to through drill (remove the step) the hole in the head with the right 8mm bit (measure it!) so the shaved head will sit down correctly. IF you cut it over .010, and dont through drill the hole, use the .010 shim (sealant on block side, head gasket on top) to keep the hole clearance correct. You can do a quick check on your cut head by laying it on the block with no head gasket. If it lays flush, your OK, if it rocks even a little, clearance that hole. Dont try and remove the plug from the block as you'll ruin the O-ring and I have not found an OEM replacement for that , just a generic one thats a little oversized.
If you have an MA 2.0 or VC 1.8 Jap motor that shares the same head, be aware that there is an "oil control plug" in the block that socket is drilled into the head with a step, ie, it is NOT a straight hole, there is interference in it if you shave the head. They sell a .010 head shim for this reason. If you shave the head more than .010, the head gasket will NOT seal as this oil control plug (that looks like a little hollow dowel on the block) will hang up the head, possibly cracking the head if you torque it down trying to seal the gasket. You need to through drill (remove the step) the hole in the head with the right 8mm bit (measure it!) so the shaved head will sit down correctly. IF you cut it over .010, and dont through drill the hole, use the .010 shim (sealant on block side, head gasket on top) to keep the hole clearance correct. You can do a quick check on your cut head by laying it on the block with no head gasket. If it lays flush, your OK, if it rocks even a little, clearance that hole. Dont try and remove the plug from the block as you'll ruin the O-ring and I have not found an OEM replacement for that , just a generic one thats a little oversized.