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44
Basic Engine
Main Bearings - Inspect
Check the main bearings for wear or other damage.
Replace both halves of the bearings and check the
condition of the other bearings if a main bearing is
worn or damaged.
Cylinder Block - Inspect
1. Clean all of the coolant passages and the oil
passages.
2. Check the cylinder block for cracks and damage.
3. Check the front camshaft bearing for wear. Refer to
Specifications, "Camshaft Bearings" for the correct
specification of the camshaft bearing. If a new
bearing is needed, use a suitable adapter to press
the bearing out of the bore. Ensure that the oil hole
in the new bearing faces the front of the block. The
oil hole in the bearing must be aligned with the oil
hole in the cylinder block. The bearing must be
aligned with the face of the recess.
Cylinder Head - Inspect
1. Remove the cylinder head from the engine.
2. Remove the water temperature regulator housing.
3. Inspect the cylinder head for signs of gas or
coolant leakage.
4. Remove the valve springs and valves.
5. Clean the bottom face of the cylinder head
thoroughly. Clean the coolant passages and the
lubricating oil passages. Make sure that the
contact surfaces of the cylinder head and the
cylinder block are clean, smooth, and flat.
6. Inspect the bottom face of the cylinder head for
pitting, corrosion, and cracks. Inspect the area
around the valve seat inserts and the holes for the
fuel injection nozzles carefully.
7. Test the cylinder head for leaks at a pressure of
200 kPa (29 psi).
This document has been printed from SPI2. NOT FOR RESALE.
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Illustration 44
Flatness of the cylinder head (typical example)
(A) Side to side
(B) End to end
(C) Diagonal
8. Measure the cylinder head for flatness. Use a
straight edge and a feeler gauge to check the
cylinder head for flatness.
• Measure the cylinder head from one side to the
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opposite side (A).
• Measure the cylinder head from one end to the
opposite end (B).
• Measure the cylinder head from one corner to
the opposite corner (C).
Refer to Specifications, "Cylinder Head" for the
requirements of flatness.
Resurfacing the Cylinder Head
The bottom face of cylinder head can be resurfaced if
any of the following conditions exist:
• The bottom face of the cylinder head is not flat
within the specifications.
• The bottom face of the cylinder head is damaged
by pitting, corrosion, or wear.
Note: The thickness of the cylinder head must not be
less than 118 mm (4.64566 inch) after the cylinder
head has been machined.
Note: The dimension of the valve seats to the flame
face must be corrected after resurfacing the cylinder
head. Refer to Specifications, "Cylinder Head" for the
correct dimensions for the valve seats.
UENR0617
g02260053
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