Thread Tools Search this Thread Display Modes
Old 07-18-2020, 10:51 PM   #1
Join Date: Jul 2020
Posts: 3
Default 4.3 Water in cylinder 4

Okay, new to me 1900SR with Mercruiser 4.3(carb) Alpha(1 I believe).

Engine ran great on a 30 minute sea trial. 2 successful boat days. Then starting having some starting troubles and would die when pulling back to idle or when putting into drive sometimes.

Took it out of the water. Freshwater rinsed just fine. Put it away for a week til I had time to play with it. Took it out and got an engine alarm 10 Minutes after start. Found, thermostat was bad. Replaced it. But when I attempted to start, it clunked and didnít turn. Checked electric all good(battery @12.7V). Tried again, It surged slowly several times then started eventually. Wasnít normal, so I pulled the plugs.
After inspection Iíve got water(salt) in Cyl 4 and in the oil pan. Manual says to change oil, run it and check for water again, but Iím leaning towards a new engine and my mechanic seems to agree.

Any recommendations would be appreciated.

If I have to get a new engine can I upgrade to a 4.7 or 5.0?

Gutie04 is offline   Reply With Quote
Old 07-19-2020, 01:29 AM   #2
mmwjr's Avatar
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 8,259

The exhaust is water jacketed and cooled. For salt water use they typically need to be replaced every 5 years due to corrosion which will allow water to get back in through the exhaust valve. I would inspect the exhaust and perform a compression test on the engine. A blown head gasket or cracked block or head may also be the source.

Not sure what a 4.7 is but either a 5.0 or 5.7 may fit it there is enough room in front of the engine box.
1997 2400 SCR
5.7 Vortec / Bravo 2
mmwjr is offline   Reply With Quote

1900sr, blown engine, engines, mercruiser 4.3, upgrade

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Popular Tags
#newbie 3.0 18 foot bow rider 454 1900sr 1993 2300scr 1995 2400 scr cabin door 2300scr 2700 3300 scr 3500bilge 4100 sca 4200 auxiliary batteries black water tank boat for sale boat parts bracket brochure build cabinet canvas cockpit cuddy dash dashboard depth electronics engines fitting force 125 carburetor bowl horn intro kitchen sink pump light lower unit oil change maintenance manifold marine generator mattress replacement maxum maxum 1800sr maxum 3300 maxum ladder mercruiser 3.0l mercruiser 4.3 monitor neutral new member oil gauge outboard part numbers puget sound raymarine seatech trailer for sale seat hardware size prop sr dash trim stalling stereo sun lounge swim platform tankwatch trim trim tabs windlass anchor window trim 3300 scr windshield wood grain gauge bezel
Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 08:17 PM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, vBulletin Solutions, Inc.