Yanmar 3TNV Series, Service Manual

Page: 107 / 213

4. Disassembly, Inspection and Reassembly of Engines
[Reassemble]
Apply sealant (code No.977770-01212) and install
the mounting flange by matching the two dowel
pins. After assembly, raise the engine with its
mounting flange on the bottom side.
Unforeseen injury may arise due to falling of slipping
when raising or reversing the engine. Carefully
operate so as not to lose balance.
Point4: Journal bearing cap
[Disassemble]
4TNV106(T) 36.250 36.275
Before removing the journal bearing, measure the
crankshaft side gap. Measure it in either method
because there are the next two methods.
1) Install a dial gage on the cylinder block, and
move a crankshaft in front and back, and
measure the side gap as shown in the right
figure.
2) Put a thickness gauge in the clearance between
thrust metal and crankshaft directly, and measure
it.
Side gap standard mm
Model Standard Limit
All models 0.13 0.23
The standard width of the crankshaft thrust part
mm
Model Standard thickness
3TNV82A 25.250 25.271
TNV84 88 28.250 28.271
0.28
[Reassemble]
If the side gap exceeds the standard, replace the
thrust metal with an oversize one.
Machine the standard width of the crankshaft
thrust part into the dimension of the below table at
the same time.
Refer to a parts catalog when ordering the part.
The surface finishing precision (refer to 4.4.5(2) in
Chapter4):
0.25mm Oversized thrust metal (0.25DS) mm
0.25DS Thrust metal assy code Standard thickness
3TNV82A 119810-02940 2.055 2.105
TNV84 88 129150-02940 2.055 2.105
4TNV94L 98 129900-02940
2.055 2.105
4TNV106(T) 123900-02940 2.555 2.605
32.250 32.275 4TNV94L 98
92