5.0l
/ 305 cid / 5.7l / 350 cid ENGINES
SERVICE MANUAL NUMBER 24
Hydraulic Valve Lifters
9
2
3
8
1
5
6
4
7
72031
Roller Lifter
1
2
3
4
5
6
7
8
9
- Push Rod Seat Retainer
- Push Rod Seat
- Metering Valve
- Plunger
- Check Ball
- Check Ball Spring
- Check Ball Retainer
- Plunger Spring
- Lifter Body
Hydraulic valve lifters require little attention. Lifters are extremely simple in design.
Normally, readjustments are not necessary and servicing requires only that care and
cleanliness be exercised in the handling of parts.
Locating Noisy Lifters
Locate a noisy valve lifter by using a piece of garden hose approximately 4 ft. (1.2 m) in
length. Place one end of hose near end of each intake and exhaust valve and other end of
hose to the ear. In this manner, sound is localized making it easy to determine which lifter
is at fault.
Another method is to place a finger on face of valve spring retainer. If lifter is not functioning
properly, a distinct shock will be felt when valve returns to its seat.
General types of valve lifter noise are as follows:
1.
Hard rapping noise - usually caused by plunger becoming tight in bore of lifter body so
that return spring cannot push plunger back up to working position. Probable causes
are:
a. Excessive varnish or carbon deposit causing abnormal stickiness.
b. Galling or “pickup” between plunger and bore of lifter body, usually caused by an
abrasive piece of dirt or metal wedged between plunger and lifter body.
2.
3.
Moderate rapping noise. Probable causes are:
a. Excessively high leakdown rate.
b. Leaky check valve seat.
c. Improper adjustment.
General noise throughout valve train. Probable causes are:
a. Insufficient oil supply.
b. Improper adjustment.
Index
Page 3A-26
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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Marine readers have rated Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID 4.0 out of 4.0 based on 1 product reviews. Great performance engine.
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