What are you measuring it is not clear at all,
post a photo of what it is pointing too it.
valve lash?
head warp (not over 0.001" per foot end to end crosswise, head and deck
no year engine told.
all engines made, the service manual is chock-a-block full of engine tolerance checks. we can't guess any of the100 checks.
my 2nd guess the shop want s top mill the head flat? not why asking>???
and wants to know max allowed,?
will ask toyota that.
many engines over milled head will ping like mad and self destruct.
due to insane new compression ratios.
SOURCE: Reinstallation of cylinder head on 4d56 deisel engine
Suspect cam timing or injection pump timing is a tooth off causing problem.
SOURCE: cylinder head torque settings for a toyota 1493cc
If you have a vehicle application for the motor you can get a Haynes or Chilton manual from your local auto parts store. They usual run around $30.
SOURCE: I need tune up specs
An old question but what the heck! :)
This page has all the torques and some tune specs http://www.motorpowerinc.com/specs/4p.html
and this pdf is for a different machine but has more specs and tuning details for the 4p [page 30]
http://www.z-car.com/SDK8/Toyota_Skid_Steer_sdk6-8_repair_manual.pdf
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