Generac Power Systems 53187 User Manual

Page 83

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SECTION 2.5
ENGINE REASSEMBLY

PART 2

ENGINE MECHANICAL

Injection Pump Asembly

Install the injection pum p, using the sam e shim s

that w ere rem oved during disassem bly. Connect con
trol rack of pum p w ith LINK and retain w ith SNAP PIN.

Retain pum p w ith bolts and nuts.

NO TE:

The

pum p

shim s

establish

the

Injection

pum p tim ing. W hen reinstalling the sam e Injection
pum p that w as rem oved, use the sam e shim s that

w ere rem oved. Fuel Injection tim ing m ust be ad

justed w henever (a) a new Injection pum p Is In

stalled, (b) a new cam shaft Is Installed, or (c) a n e w

cylinder block Is used. See Part 4, "ENGINE FUEL
SYSTEM " for tim ing adjustm ent procedure.

Oil Filter, Oil Pipe, Feed Pump and Tap

pets

1. Coat oil filter m ounting face w ith light film of oil and
install. Tighten by hand.

2. Install the feed pum p assem bly, using tw o bolts.
3. Coat tappets w ith oil and install.

Cylinder Head Assembly

1. Set each piston at top dead center (TDC), one at a

tim e. W hen the pistons are at top dead center (TDC),

m easure their protrusion above the cylinder block w ith
a depth gauge or a dial indicator. Measure the protrus-
tion of all three pistons. Use the largest protrusion to
select a cylinder head gasket having the correct thick
ness.

PR^R%I?(J

TH?ClfNKS

0.018-0.021 inch

(0.45-0.55mm)

0.043 inch

(1.1 mm)

0.022-0.026 inch
(0.55-0.65mm)

158-70939

0.047 inch

(1.2 mm)

0.026-0.029 inch
(0.65-0.75mm)

159-70939

0.051 inch

(1.3 mm)

NO TE: The thickness of the head gasket, w hen
tightened. Is stam ped at top of gasket (as. 1, .2, .3).

Figure 15. Piston Protrusion above Cylinder Block

2. Install the glow plugs.
3. Tighten the cylinder head bolts in three (3) phases
and in the sequence show n in Figure 16. Alignm ent
pins are provided for proper positioning. Coat all bolt
threads w ith m olybdenum disulphide grease.

OIL PIPE EYEBOLT TORQUE

CYL. HEAD FINAL TIGHTENING TORQUE

7-9 Ft.-Lbs. (1.0-1.3m -kg)

33-36 Ft.-Lbs. (4.5-5.0 m -kg)

Figure 16. Cylinder Head Tightening Sequence

PAGE 2.5-4