#126
IP: 38.27.109.137
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Of course. I wasn't criticizing your judgment, and I apologize if you took it that way. People go up the mast all the time. If given a choice, I don't.
Bill |
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Ando (07-14-2020) |
#127
IP: 174.255.137.223
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Overheating Assistance Please
Ok guys, RWC late model with overheating which I plan on tackling this weekend. A bit of background, I recently did a muriatic flush of the cooling system. Today, to prepare for this weekend's task of resolving the overheating (and hopefully to get a better idea where there might be a block in the cooling system) I got a laser heat gun and at about the 15 min mark pointed it at different points of the engine and these are the readings that I got.
Thermostat gauge went from 140 to 160; Spark plugs were in the range of 180-185 (#4 being the hottest); A bunch of points all over the head were around 160-174 Manifold was mostly cool (like 150 or less) so was the area around the thermostat housing and the water jacket plate was even cooler. The connection from the manifold to the exhaust was very high (like 340)! Does this point to the area of the blockage in the cooling system being at the manifold exhaust connection? Is that where I should start looking for the blockage? I read somewhere that that particular connection is a common problem area. All input appreciated. Thx in advance Last edited by Ando; 07-29-2020 at 06:00 PM. |
#128
IP: 47.142.137.42
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Quote:
As you probably know you can flush the KRAP out of the manifold with city water pressure. I recommend it. Do you have the Thatch Modification? The Thatch Modification introduces cooling water in to the manifold at the low end which eliminates air pockets and makes for better manifold cooling. You would get more responses if you would start a new thread for each new "adventure". ex TRUE GRIT |
#129
IP: 45.49.35.172
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Yes, ndutton told me about the thatch mod and I do have it set up like that. I'll check to see about that 90 degree barb once I get back there. Thx so much, Prof. Emeritus
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#130
IP: 24.152.132.140
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While those numbers seem a little high for a RWC engine, I'm not seeing a big problem. What suggests it's OVERheating? What am I missing?
__________________
Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#131
IP: 45.49.35.172
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Piece of mind when I'm out there. It's bothering me. When I rev it, it goes up to 180 and smoke has now started coming out the back. It's clearly smoke, just like the old engine did before I killed due to lack of oil 180 is just too close to 220 to me, especially when I'm out there.
Side note: I checked the oil level today and it was low so I'll be doing an oil change this weekend as well. Also, I remember the adventure I've been on before and although I appreciate it and the people I've met along the way and the knowledge I've gained, I dont want to re-live it, I guess I'm just extra sensitive. Ignorance is bliss. I spent a lot time and mental energy in getting a replacement engine and refurbishing it with your help it and did so in time for this sailing season and I want it to tick like a clock and work as it should. That's it. I mean, shouldn't be getting no hotter than say, what, like 160 when I push the throttle? Right? |
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TimBSmith (10-20-2020) |
#132
IP: 47.142.137.42
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Quote:
Sounds to me like you need a dry and wet compression test. ex TRUE GRIT |
#133
IP: 108.185.228.107
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I’ll check the spark plugs this weekend, but a “wet and dry compression test” is novel to me. How do I do that? What do you mean wet and dry?
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#134
IP: 24.152.132.140
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A few questions/suggestions re: elevated heat:
__________________
Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#135
IP: 155.186.124.219
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Ando. first do the "dry test". Be sure the batteries are fully charged, all spark plugs removed, choke open and the throttle set to full. Now do a compression test on each cylinder. I do them twice for checking MY consistancy. That is the dry test.
Wet test is the SECOND test. Now "spray" some WD-40 or spray oil of some sort into the cylinders. Now test again while the cylinder is wet with oil. The oil will fill some of the gaps in the rings if they are worn and you should see "more compression" if the rings are bad. If the compression numbers stay the same and are low you may have valve issues. Dave Neptune |
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Ando (07-30-2020) |
#136
IP: 165.225.38.121
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and if applicable, do not forget to close your cooling water seacock when doing compression test... or it could become a true wet test...
__________________
Surcouf A nostalgic PO - Previously "Almost There" - Catalina 27 (1979) |
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Ando (08-02-2020) |
#137
IP: 108.185.228.107
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Quote:
Water pump is brand new Yes, muriatic acid wash was done recently Yes as to the bypass valve. Ok I’ll try removing the thermostat and closing the valve and report back. But as to wet and dry compression testing as advised by Dave Neptune, I recall we did a dry compression test at the start of the season and at that time compression was as follows: 1. 115 2. 95 sparking stopped 3. 100 4. 100 And I will be doing a wet and dry compression test after going over the steps above |
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Captain Crunch (08-05-2020) |
#138
IP: 174.255.137.223
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Update
Flow sensor removed and replaced with straight water line. Found a couple small barnacles inside the flow sensor.
Removed and checked both manifold input and output barbs (the input is a 90 degree barb but it was clean). Removed manifold and high pressure washed it. Oil changed Dry compression test results (from 1-4): 105, 100, 100, 100. Wet compression test results to follow (I will be using MMO). I have not removed the thermostat yet. Planning on running it after the wet compression test and seeing what the temp is at to see if the flow sensor removal did the trick. |
#139
IP: 174.255.137.223
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See comments directly above.
Wet compression test results (I put MMO in each cylinder first, which wasn’t the best idea...should have put it in each individual cylinder prior to testing because the other three cylinders shot out MMO in the first test): Wet test 1: 200, 120, 120, 115 Just to be sure Wet test 2: 165, 118, 120, 115 *test 2 was done without placing any more MMO in each cylinder (ie I put MMO in each then tested each cylinder twice and so the MMO was probably all shot out during the first test of the first cylinder). Last edited by Ando; 08-01-2020 at 03:55 PM. |
#140
IP: 174.255.137.223
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See comments above
I’m not sure what “fouled” spark plugs look like, but here are mine: Last edited by Ando; 08-01-2020 at 04:33 PM. |
#141
IP: 174.255.137.223
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See comments above.
Water flow is way way way better now. Now my temp gauge isn’t working, but I still have my temp gun and at ~15min of running time it reads between 160-190 at different point along the head, the manifold reads between 100-120 and the connection to the exhaust reads around 400. Edit: the temp gauge IS working, but only when the engine is off does it give me a reading lol. When it’s on, the pointer falls to below 100. So weird, right? Last edited by Ando; 08-01-2020 at 04:46 PM. |
#142
IP: 24.152.132.140
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Please save the flow sensor as-is for me (tomorrow afternoon?).
__________________
Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
The Following User Says Thank You to ndutton For This Useful Post: | ||
Ando (08-01-2020) |
#143
IP: 174.255.137.223
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Yes, sir. I’ll be here.
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#144
IP: 24.152.132.140
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Forensic examination of the flow sensor showed a minor amount of detritus inside but nothing that restricted its movement, encumbered its function or affected its flow. I do not know if removal from the boat dislodged anything that might have been inside, just reporting the condition as I received it.
Do you have a raw water strainer installed (I think I remember you do)? What size is your intake thru-hull? Does it have an external strainer?
__________________
Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others Last edited by ndutton; 08-03-2020 at 09:50 PM. |
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Ando (08-03-2020) |
#145
IP: 45.49.35.172
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Quote:
I do not have a raw water strainer installed. Re the size of the thru-hull intake: I have to go back and double check, but if I recall, it is 3/4”. As for the external strainer, I do have this: |
#146
IP: 71.222.36.208
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Ando-
Assuming you are currently in the water as opposed to on the hard, I would take a swim and check that external strainer. Those are notorious for filling and clogging with stuff. Especially sea life. It could absolutely be limiting your intake of cooling water.
__________________
-Jerry 'Lone Ranger' 1978 RANGER 30 |
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Ando (08-04-2020) |
#147
IP: 71.222.36.208
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Quote:
Please note this comment back in post #138 Ando- The fact there were barnacles inside the flow sensor would lead me to believe they are also living in that external strainer as well.
__________________
-Jerry 'Lone Ranger' 1978 RANGER 30 |
The Following User Says Thank You to roadnsky For This Useful Post: | ||
Ando (08-04-2020) |
#148
IP: 24.152.132.140
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That's why I retrieved the sensor for closer examination. When I opened it up there were no barnacles inside, only a few minor specks of greenish growth, none of it hard. Because of the condition of the sensor I immediately started thinking something else might be restricting the flow. Sensor autopsy pics attached.
__________________
Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
#149
IP: 174.255.128.42
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Here’s a pic of the barnacles I found, one (blurry in the foreground) and one in the back).
I had my diver double check the strainer a couple weeks ago and myself put a rebar down the thru-hull from the top that same day. Thru-hull is, in fact, 3/4” btw. |
#150
IP: 24.152.132.140
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That barnacle could certainly affect the flow but was not present when I got the sensor. I would like to see three things happen:
__________________
Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
The Following User Says Thank You to ndutton For This Useful Post: | ||
Ando (08-05-2020) |
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