Inspection Of Cylinder Head - TOHATSU MD 70-90C2 Service Manual

Power Unit
2. Loosen cylinder head / head cover mounting bolts in the
order shown, remove them, and remove cylinder head /
head cover.
• When loosening M8 bolts, loosen in
descending order of the numbers shown
embossed on the head cover.
• Handle cylinder head / head cover taking care
not to scratch their mating surfaces.
Remove engine anode 1 and check it.
3.
Replace it if it is reduced to 2/3 of the original
size.

16) Inspection of Cylinder Head

1. Remove carbon deposit in the combustion chamber of
cylinder head, and check the interior for degradation,
damage and other defects.
2. Check water jacket interior for deposits.
When cleaning mating surfaces of cylinder head
by using a means such as a scraper or wire
brush, be careful not to scratch the surfaces.
Use straight edge 1 and thickness gauge 2 to check
3.
distortion of cylinder head 3 in the directions shown.
Repair or replace if the distortion is over the specified limit.
Thickness Gauge :
Commercially Available Item
Functional Limit :
0.03 mm（0.0012 in）
5-30
2
6
10
1
14
11
7
3
1 1
3
2
1
5
9
13
3
12
8
2
4
1
TLDI 75/90C2 2010