Valve shims are used to compensate for worn valve springs. Your local machine shop will have the tools to check.
.2mm for intake and .3mm exhaust. or .008in and .012in when the motor is warm. not sure for cold motor.
The 1991 Toyota Corolla does not have a zero-clearance engine. It has a non-interference engine. This means that the pistons will not travel to the pistons.
you can not adjust.does it byself
4 cylinder does not have pcv valve.
spell check your as\nswer
Try this http://tw200forum.com/index.php?/topic/361-adjusting-the-valve-clearance/
On the side of the silver canister
on top of the valve body inside the transmission
Buy a conversion kit (R-12-R-134A) at Wal-Mart or auto parts comes with instructions
29,40,51 lbft
Its on the passanger side valve cover under a clutter of little hoses near the firewall
None. They are the same 7th Generation Corolla 1991 to 1997 (1998 model year) with either a 1.6Liter 4A FE or 1.8Liter7A FE and they will swap nicely or another of same drop right in. All electronics, ECM are same. A VERY FEW 1998 model year Corollas got the (then) new 1ZZ FE but a '93 in to a '96 no problem