(04-05-2014, 16:54 PM)coriducu Wrote:  Hello guys
I would help my godson who open recently a cylinder head,crankshaft engine block etc repair shop.He ask me for some technical catalogs for cylinder head maintenance(how much can be take from initial thickness,how much is allowed to came out a valve from cylinder head,etc)
I hope I made myself understood what I'm interested.Some of this data can be take from reparation manual of each manufacturer but information are weak and I thought someone can help me with some information.
Thanks in advance

(04-05-2014, 19:55 PM)McMihai Wrote:  

(04-05-2014, 16:54 PM)coriducu Wrote:  Hello guys
I would help my godson who open recently a cylinder head,crankshaft engine block etc repair shop.He ask me for some technical catalogs for cylinder head maintenance(how much can be take from initial thickness,how much is allowed to came out a valve from cylinder head,etc)
I hope I made myself understood what I'm interested.Some of this data can be take from reparation manual of each manufacturer but information are weak and I thought someone can help me with some information.
Thanks in advance

the information you're looking for is scarce
people dealing with rectified and repaired cylinder head (turners) may have some information

(15-05-2014, 21:56 PM)shadab Wrote:  Finding the accurate oil clearances for each and every engine is very tedious job. Improper oil clearances can lead to serious damage to the engine. I have been in the field of automotive repairing and maintenance since 1976. I have always relied on my formula which is as under. It may be helpful to other members as well. Just try it, if it is found useful, make it your own otherwise discard it. It may vary +/- 0.005 mm from the OEM data. The answer is almost compatible with the OEM values. You may try this confidently whether the engine is gasoline, diesel, car or truck. I have not received a single complaint so far.
Diesel Engine:
NOTE: Always measure the piston to cylinder clearance with the help of cylinder gauge and micrometer.
To find the piston to cylinder clearance of diesel engine at room temperature:
Piston to cylinder clearance = 0.0008 X Piston diameter in mm. (Diesel car, Diesel truck or Diesel Generator). (NOTE: Always measure the piston diameter at the distance of 12.5 mm from the lower edge of the piston skirt, perpendicular to the piston pin at room temperature).
The piston ring end gap will automatically come to its default clearance. To verify, insert the top piston ring into the cylinder with the mark pointing upward, push it about 20 mm down with the piston from the cylinder top face and measure the oil clearance with feeler gauge.
multiply 0.0045 X piston diameter = Ring end gap.

To find the piston to cylinder clearance of gasoline engine at room temperature:
Piston to cylinder clearance = 0.0007 X piston diameter mm.
Hope that works.
Thanks.

(17-05-2014, 21:07 PM)shadab Wrote:  Hi friend. Have a good day. May I know which specific data, for which manufacturer and model do you want to know?
The constants which I have described here are almost the same for all manufacturers, models and makes.
Now for specific model would you please let me know for example:
Toyota Corolla 1NZ-FE:-
- Piston to cylinder clearance.
- Valve to guide clearance.
- Valve seat edge thickness.
- Main and big end journals to crankshaft thickness and so on.
Thanks.