Cruisers Forum

Join CruisersForum Today

Thread Tools Search this Thread Rate Thread Display Modes
Old 24-01-2020, 07:38   #1
Registered User

Join Date: Oct 2008
Posts: 295
engine coolant flow

Which way dose the coolant water flow?
From the pump thru the oil cooler, heat exchanger the exhaust manifold and then the block?
Or, from the pump to the block, the exhaust manifold, the heat exchanger, the oil cooler and back to the expansion tank?

roberttigar is offline   Reply With Quote
Old 24-01-2020, 20:33   #2
Registered User

Join Date: Nov 2014
Posts: 1,165
Re: engine coolant flow

The coolant flow can differ somewhat between different brands of engine, but a typical flow is as follows:
-From the circulation pump into the block, down the length of the block and up into the cylinder head. From the head there are usually two options:
1. Out of the head and into the exhaust manifold, and from the exhaust manifold thru the thermostat housing and to the heat exchanger. Or
2. Out of the head via the thermostat housing and then into the exhaust manifold and then to the heat exchanger.

Sometimes the return coolant from the heat exchanger goes thru the oil cooler before returning to the circ pump. Sometimes a small amount of coolant is diverted from the block to the oil cooler, and sometimes the oil cooler is cooled by sea water and it's not in the coolant circuit at all.

The above are probably the more common flow paths, but there are always exceptions to the rule.....

DougR is offline   Reply With Quote
Old 26-01-2020, 15:04   #3
Bailing as fast as I can.
GILow's Avatar

Join Date: Sep 2008
Location: Adelaide, South Australia
Boat: Swanson 42
Posts: 6,531
engine coolant flow

My engine (Nissan) is as DougR described in option 2.

Edit: by oil cooler I assume you mean engine oil? My transmission oil is cooled by a separate raw water heat exchanger which is actually between the sea water strainer and the raw water pump. This struck me as odd but it is how it has always been done by the company that marinised my engine.
Count-down has commenced.
GILow is offline   Reply With Quote

coolant, engine

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Sea water back-flow through engine Karanga Construction, Maintenance & Refit 24 21-07-2019 12:04
Engine cooling water flow? pwilletts Engines and Propulsion Systems 6 16-07-2016 09:06
Engine back flow? sailwidow Engines and Propulsion Systems 4 07-06-2016 05:23
Engine Coolant Expansion Tank Question Beausoleil Engines and Propulsion Systems 5 10-09-2009 17:13
Space Heating from Engine Coolant Sonosailor Engines and Propulsion Systems 16 02-12-2004 14:09

Advertise Here

All times are GMT -7. The time now is 01:59.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.