How to calibrate the cylinder of Yanmar 3TNV and 4TNV engines

This article describes how to calibrate the cylinders of Yanmar 3TNV and 4TNV engines

 

 

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1) Slight uneven worn, flawed, etc. shall be

corrected by honing only.    If the cylinder is

unevenly worn partially, flawed or otherwise

damaged and cannot be repaired simply by

honing, rebore the cylinder first and then hone. See 4.4.5.(1)(c) for the boring dimension.

2) Items to be prepared for honing

l Flex-Hone

(see No.8 of 4.1.2 in Chapter 4)

l Electric drill

l Honing fluid

(50:50 mixture of lube oil and diesel oil)

 

 09.2024 Yanmar SA-Direct 2.45 Offline Diagnostic Software

 

3) Apply the honing fluid to the Flex-Hone and turn   the electric drill at 300 to 1200 rpm.    Then insert the Flex-Hone into the cylinder bore while turning it, and move it up and down for about 30 sec. to   obtain a honing mark with a cross hatch angle of

30 to 40 .

[NOTICE]

1) Avoid faster revolution than 1200 rpm since it may cause breakdown.

2) Do not insert or extract the Flex-Hone in    stopped state because the cylinder will be 

                                                                              

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