John-deere stx38 User Manual download pdf (Page 71)

4/23/97

3 - 39

ENGINE

REPAIR

5. Measure inside diameter of crankcase lifter bore

(D).

6. Subtract lifter OD. from bore ID. to determine if

clearance is not within specification.

IMPORTANT: Make sure lifters are “PRIMED”

before installation and “BLED” before start up

to prevent damage to push rods or rocker arms.

See priming and bleeding procedure on page 3-

41.

7. Replace lifters that are worn or damaged. Replace

components as necessary.

Specification:

Valve Lifter To Bore Clearance (maximum)

. . . . . . . . 0.0124—0.0501 mm (0.0005—0.0020 in.)

Priming Procedure For Hydraulic Lifters

1. Place lifter in small container.

2. Pour 10W30 oil into container until oil is level with

top of lifter.

3. Place the end of one of the push rods into the

socket on top of the lifter and “pump” the lifter with

push rod until it feels solid.

4. Remove lifter from oil, let it drip off for a moment,

and install into appropriate bore in engine.

Bleed Procedure For Hydraulic Lifters

1. After installing cylinder head, rotate flywheel so

piston is at TDC (top-dead-center) between the

exhaust and intake strokes. At TDC, the rocker

arms will move alternately if the flywheel is rocked.

This allows for maximum pressure on the lifters.

2. Leave engine in this position and re-assemble

remaining engine parts.

3. After engine has been in this position for 10 minutes

(can include assembly time) turn engine over

slowly by hand.

4. If engine turns over completely, fill the crankcase to

proper level with recommended oil and test run.

5. If engine does not turn over completely (locks up at

some point), stop turning at the point of lockup and

allow 10 more minutes for the lifters to bleed down.

Then try rotating by hand again.

Results

• Lifter noise immediately after start-up is usually due

to contraction and/or leakdown. There will be some

noise when engine is first started but should last

only a few seconds, but no more than a few

minutes.

• If lifter is still noisy after 5 minutes of running, air

could be trapped in the lifter. Stop engine and

check oil level. Adjust as necessary and run

engine for an additional 20 minutes at half throttle.

BALANCER SHAFT REMOVAL &

INSTALLATION

1. Align marks (A) on balancer shaft and crankshaft.

2. Remove balancer shaft (B).

3. Inspect balancer shaft, replace as necessary.

4. Align marks (A) and install balancer shaft (B) so it

also aligns with governor gear (C).

5. Remember, when installing oil pan, be sure to align

flat (D) of balancer shaft with bore flat of oil pump

inner rotor gear.

M52097

M52099

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John-deere stx38 User Manual Page 71

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