Mercury MerCruiser 496 CID 8.1L Gasoline Marine Engines Service Manual Number 30

TROUBLESHOOTING

SERVICE MANUAL NUMBER 30

Engine Overheats

Mechanical

Cause

Special Information

Engine rpm below specifications at wide

open throttle (engine laboring)

Damaged or wrong propeller; growth on

boat bottom; false bottom full of water

Spark plug wires crossed (wrong firing

order)

Lean fuel mixture

Wrong heat range spark plugs

Exhaust restriction

Jumped timing chain, or improperly

installed

Valve timing off

A blown head gasket(s) normally cannot

be detected by a compression check. Nor-

mally the engine will run at normal temper-

ature at low rpm, but will overheat at

speeds above 3000 rpm.

Blown head gasket(s)

Insufficient lubrication to moving parts of

engine

Defective oil pump, plugged oil passage,

low oil level

INDEX

Page 1C-20

90-863161 SEPTEMBER 2000

Product Specification

Categories	Mercury MerCruiser Manuals
Tags	Mercury MerCruiser 496 CID
Model Year	1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
Download File	Please Enter the Security Characters Shown Below. Letters are Case Sensitive. Your download link will appear upon completing this step. - 355 pages
Document File Type	PDF
Copyright	Attribution Non-commercial

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Mercury MerCruiser 496 CID 8.1L Gasoline Marine Engines Service Manual Number 30 SKU UPC Model

Sven-Erik Walin on Jun 10, 2018. crankcase ventilation

How many openings for crankcaseventilation is there on
Merc 496 HO ?

John fox on Apr 11, 2018. Manual

Great down load . it was all there an more