Yanmar 4LHA-HTP User Manual

Chapter 2 Basic Engine
8. Camshaft and Tappets
8-2 Tappets
(1) The tappets are offset to rotate during operation and
thereby prevent uneven wearing. Check the contact of
each tappet and replace if excessivety or unevenly
worn.
,4LHA Series
mm (in.)
Standard
Wear limit
Tappet stem outside dia.
14.218-14.233
(0.5598 - 0.5604)
14.17
(0.5579)
Tappet guide hole inside
dia. (cylinder block)
14.249- 14.270
(0.5610-0.5618)
14.30
(0.5630)
Tappet stem and guide
hole oil clearance
0.016-0.052
(0.0006 - 0.0020)
-
Abnormal contact
Normal contact
(3) Measuring push rods.
Measure the length and bending of the push rods.
Offset
Offset
NOTE: When removing tappets, be sure to keep them
separate fbr each cylinder and intake/exhaust
valve.
(2) Measure the outer diameter of the tappet, and replace if
worn beyond the limit.
mm (in.)
Standard
Wear limit
Push rod length
178.25- 178.75
-
Push rod bend
0.03 or less
(0.0012)
0.3
(0.0118)
Push rod dia.
8 (0.3150)
- •
2-34

Yanmar 4LHA-HTP Specifications

General

Brand	Yanmar
Model	4LHA-HTP
Category	Engine
Language	English