Re: 1992 Evinrude 150 Miss
Check #1 cylinder for water. If plug is super clean its being steam cleaned. This is caused by a crack in the block behind the sleeve. It is a occasional problem for these engines. You can remove the head and inspect as it has no head gasket only o-rings that can be reused.
Following from Mar-Fab Repair:
1991 & up carbureted
150/175 HP 60 degree V-6 Evinrude
and Johnson outboards (6V-6 Eagle)
Description: Approximately 25% of
the V-6 blocks we test will show a leak
into the #1 cylinder from the center water
cavity underneath the regulator/rectifier. In
certain cases, a leaking engine may develop a
knock at around 3500 rpms. The sparkplug
may also show signs of water, and the cylinder
head?s combustion chamber, piston dome,
and/or exhaust port may show signs of being
steam cleaned by water. It is important to note
that some engines in the early stages of
leaking may not show the mentioned
symptoms and can only be detected by
pressure testing the block.
Cause: The leak develops from a thin section
in the block.Due to engine vibration,
varying pressures, expanding and
contracting, the aluminum cracks
over time and causes water to leak
from behind the sleeve.
Repair & Results: MarFab can provide
its dealers with a remanufactured block
or powerhead, or can repair the leaking
block by welding and re-sleeving.MarFab
has been repairing V-6 leaker blocks since early
2002. Blocks are pressure tested after all work is
performed to ensure proper repair has been
made.
Limited Warranty: MarFab warranties its V-
6 powerheads, blocks, and repairs for 1 year
from date of purchase and/or repairs against
water leaking into #1 cyl from area discussed
above.MarFab?s warranty is limited to repair or
replacement of block only. Other warranties
may apply to a MarFab remanufactured
powerhead. (See Mar-Fab powerhead
warranty sheet)
TB0209
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www.mar-fab.com
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