#1
IP: 142.68.251.198
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Cooling flow diagram
Here is a basic cooling flow diagram I made up to donate to the forum. If anyone wants one in a different format, PM me. Get the MMI manual and accompanying notes for more complete information.
I am not at all familiar with early model A4s. Please correct me if I am wrong with either of these diagrams, since I am not an expert on engines. UPDATES: 11 July 2010 - slightly revised late model diagram, and added early model draft diagram.
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1974 C&C 27 Last edited by rigspelt; 07-11-2010 at 10:44 AM. Reason: Added early model diagram |
#2
IP: 68.126.195.251
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Thank you for this.
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#3
IP: 64.203.32.52
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Nice
Hey Rigs, nice job especially showing the diverter!!!! I have seen many a side plate at a friends shop with just a Tee fitting~~not good. He stated that some customers say that they get "more water" through the Tee than the diverter~~bad idea!
Dave Neptune |
The Following User Says Thank You to Dave Neptune For This Useful Post: | ||
pdecker (06-28-2017) |
#4
IP: 142.68.241.19
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I've been asked to add an early model flow diagram. See the original post in this thread. I am not at all familiar with early model A4s, so please comment if something is not right.
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1974 C&C 27 |
#5
IP: 174.94.20.59
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Quote:
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#6
IP: 75.134.122.158
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Thanks for the cooling diagram post!
Although this is an old post, I'm glad I discovered it.
I am working on my Cal 30 which has had a newer (1975) motor installed but never really operated. It appears that the PO used stuff from the old installation and put it on the newer engine. I couldn't figure out why I had a T at the water pump and also at the exhaust manifold outlet. Now I can see that they don't need to be there. It will make it much easier to plumb since I'm replacing all of my hoses. Murph S/V Amalia 1965 Cal 30 |
#7
IP: 76.7.135.1
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Yep. Rigs did a great job with the diagrams. Your diagnosis is spot on. Early model cooling blended into a late model. Dan S/V Marian Claire
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#8
IP: 12.97.184.71
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Don't forget folks there is a dedicated section on this site that has all kinds of great drawings posted there.
Admin Bill went to the trouble of setting it up... we should put it to use. http://www.moyermarine.com/forums/fo...c&daysprune=-1
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-Jerry 'Lone Ranger' 1978 RANGER 30 |
#9
IP: 24.152.131.153
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Although the older Dole system is preferred by many, the diagram demonstrates it's drawback. While the engine is cold and warming up there is reduced water flow to the exhaust.
Vetus waterlifts in particular are very sensitive to elevated exhaust temps.
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Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#10
IP: 76.7.135.1
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One of the reasons I use the original, or my version of such, pre-Dole T stat set up. But I have blabbed on about this before. Dan S/V Marian Claire
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#11
IP: 98.203.24.132
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What is the difference between the diverter and tee fitting?
I am tackling my cooling water issues this week on my RWC late model engine. What's the difference between the diverter and the tee fitting? Is the diverter a valve? Can it be cleaned out?
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#12
IP: 71.38.68.214
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Quote:
The Diverter is a part of the T-Fitting that is just inside the Water Jacket. It diverts the cooling water flow aft towards the #4 cylinder. (Ideally, aft and at a 45° down angle) Rigs diagram above points out both. Both should be cleaned periodically as well as opening up the Water Jacket and cleaning out the inside passages. There are quite a few threads about doing this procedure.
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-Jerry 'Lone Ranger' 1978 RANGER 30 Last edited by roadnsky; 06-28-2017 at 11:42 AM. |
The Following User Says Thank You to roadnsky For This Useful Post: | ||
pdecker (06-28-2017) |
#13
IP: 173.85.106.132
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So I'm a new A4 owner and learning a lot here. One thing I get confused with often...
People are discussing the cooling system, but I don't know if they are talking "Raw water" or FWC. When is there a significant difference in maintenance, operation, and troubleshooting? It would seem like the FWC is way less prone to problems, being less corrosive and a CLOSED SYSTEM. Thanks BW |
#14
IP: 98.171.168.92
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Quote:
A FWC system has a different problem set than a RWC system. In general if a FWC system problems are with the FWC apparatus and a RWC problems are inside the engine itself. Which would you rather have? When one converts to a FWC system the engine cooling passages are made as squeaky clean as possible. The initial cleaning plus antifreeze coolant makes for much improved cooling and zero engine corrosion. TRUE GRIT |
The Following User Says Thank You to JOHN COOKSON For This Useful Post: | ||
Brent W (07-01-2017) |
#15
IP: 32.216.249.209
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Cooling System Hose Replacement
Guys,
I sprang a leak in the hose going from the water pump to the "T" on the side plate. What is the proper procedure for replacing? Do I need to remove the alternator, the distributor and the water pump? Thanks, Joe Irwin Comp30 Blueberry Pie |
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