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Old 05-19-2021, 03:05 PM   #1
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120 Diesel Lehman Over heating

May I ask all of you experienced and knowledgeable folks to take a look at my video of my motor running and the Coolant reservoir "Burping" and comment if this is "Normal"
And if it isn't I'd, sure be grateful for any constructive comments and suggestions as to where I can find the culprit......

Thanks

Tom McBride
Long Beach
Shoreline Marina.


https://drive.google.com/drive/folders/1FRLH4lPt2l-U2LKLyUI27h_mAYHtEXci?usp=sharing
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Old 05-20-2021, 05:02 PM   #2
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I suspect I have a compromised Head Gasket .
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Old 05-20-2021, 05:11 PM   #3
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I could not see the video since it wants me to sign in. But I would call Brian at American Diesel. He is the man as far as Lehmans go. 804-435-3107
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Old 05-20-2021, 05:13 PM   #4
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you should set the Drive for no request needed as some may not click on it.
I do not see any overheat issue from that, with rad cap off that is what they all do. Burping air suggests you need to bleed it.
1st video at 48 second mark your left hand is beside the petcock. With engine off have you bled the air out of there? open it and let out air until only water comes out.

Your temp gauge was around 120, it is not up to operating temp until about 170-180.
Rad caps. If you are loosing water after operation, replace caps.
There may be more to it, but reply to this first.
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Old 05-20-2021, 05:28 PM   #5
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Dave, try this link, no sign in needed.

https://drive.google.com/file/d/1Fo0...ew?usp=sharing

and this one

https://drive.google.com/file/d/1FZ2...ew?usp=sharing
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Old 05-20-2021, 05:32 PM   #6
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Originally Posted by Soo-Valley View Post
They wouldn’t play, problem with the video or the like on both links. Could be because I am on my iPad.
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Old 05-20-2021, 05:35 PM   #7
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Sorry folks,
I just realized my error and have OPENED sharing!
Thank you ALL for your assistance
TM
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Old 05-20-2021, 05:42 PM   #8
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Thank you for your reply,
Answers and comments below

Quote:
Originally Posted by Soo-Valley View Post
you should set the Drive for no request needed as some may not click on it.
DONE Thank you for the suggestion

I do not see any overheat issue from that, with rad cap off that is what they all do. Burping air suggests you need to bleed it.
OK, I thought I bled it correctly,
I left the air nipple on the Exhaust Manifold open and filled the reservoir until it "peed out, then closed it and then started the motor


1st video at 48 second mark your left hand is beside the petcock. With engine off have you bled the air out of there? open it and let out air until only water comes out.YES I have done this procedure

Your temp gauge was around 120, it is not up to operating temp until about 170-180.
OK, good to know, I may have been "hasty. I'll attempt run the motor again and get it up to operating temp

Rad caps. If you are loosing water after operation, replace caps.
Noted

There may be more to it, but reply to this first.
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Old 05-20-2021, 05:45 PM   #9
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Originally Posted by Comodave View Post
I could not see the video since it wants me to sign in. But I would call Brian at American Diesel. He is the man as far as Lehmans go. 804-435-3107
Thank you...NOTED
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Old 05-20-2021, 05:51 PM   #10
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Tom,
Do the bleed again and fill the reservoir, rad cap on and run up to operating temp. If possible do a short run at cruise, return, let it cool and see if you lost any fluid.
As suggested a head gasket issue would do more than a few burps. as it heats there will be water expansion which is seen as it overflows.
As you can see I am hoping it is not head gasket.
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Old 05-20-2021, 05:52 PM   #11
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Did the engine actually overheat?
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Old 05-20-2021, 05:58 PM   #12
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Originally Posted by Soo-Valley View Post
Tom,
Do the bleed again and fill the reservoir, rad cap on and run up to operating temp. If possible do a short run at cruise, return, let it cool and see if you lost any fluid.
As suggested a head gasket issue would do more than a few burps. as it heats there will be water expansion which is seen as it overflows.
As you can see I am hoping it is not head gasket.
This is a GREAT suggestion, I wonder if I've been too hasty thinking that there is a Head gasket compromise, I WILL do as you have suggested and ensure that there is NO AIR remaining in the system before "jumping to conclusions"
Additionally, I appreciate your concern and hopes that it is not a HG Issue
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Old 05-20-2021, 06:07 PM   #13
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Originally Posted by hobbystuff View Post
Did the engine actually overheat?
So, This is good question and Yes,
It did on two different occasions.

I warmed the motors as usual for about half an hour before going underway, leaving the marina operating temps approx. 120f, (Normal)
then while underway (idling) after leaving the marina and bumping up the RPM easily outside of the no wake zone (never aggressively or excessively,
the Overheating alarm sounded and the temp gauge showed 220f (ish)

I immediately shut it down and left the other motor running to get me back to my dock,

I went below and my catch basin was FULL of Coolant and Water and the Reservoir was empty.
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Old 05-20-2021, 06:23 PM   #14
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Originally Posted by Tom Foolery View Post
So, This is good question and Yes,
It did on two different occasions.

I warmed the motors as usual for about half an hour before going underway, leaving the marina operating temps approx. 120f, (Normal)
then while underway (idling) after leaving the marina and bumping up the RPM easily outside of the no wake zone (never aggressively or excessively,
the Overheating alarm sounded and the temp gauge showed 220f (ish)

I immediately shut it down and left the other motor running to get me back to my dock,

I went below and my catch basin was FULL of Coolant and Water and the Reservoir was empty.
This last bit changes it up a bit. If it overheats away from dock shut down, you can always restart to dock.
Other things can be raw water impeller, heat exchanger, hoses, thru hull. Still not seeing the head gasket looking at video.
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Old 05-20-2021, 06:25 PM   #15
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Additionally,

I have inspected ALL hoses and looked for any collapsing hoses, inspecting for integrity, cracks, leaks, rips or tears.

I have removed just about every cooling hose looking for any obstructions or anything that would restrict water coolant/flow.

Cleaned out ALL coolers (Oil and Transmission)
Took a brass gun cleaner and cleaned ALL small holes removing any (calcium?)
Build-up.

Removed flushed, cleaned and reinstalled my Coolant Reservoir.

Removed and tested my thermostat testing it to boiling water and watched it operate and open as it heated up to temp. (Worked perfectly) drain hole in thermo clean and clear - reinstalled.

Removed Front Exhaust Manifold cover (replaced gasket) and Rear manifold cover (replaced gasket) and inspected and cleaned Exhaust Elbow as well as the salt water elbow (gasket replaced)
No obstructions in the Exhaust manifold and was bale to see adequate light all the way thru.

Re-assured by my bottom cleaner that the strainer has no obstructions where the water coms into feed the Jabsco impellers.
Checked and removed that hose inspected.

Removed and replaced my rubber Jabsco impeller.
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Old 05-20-2021, 06:29 PM   #16
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Answer in red typing:

Quote:
Originally Posted by Soo-Valley View Post
This last bit changes it up a bit. If it overheats away from dock shut down, you can always restart to dock.
Yes, I did restart it to assist me in docking it as I have yet to try to dock my vessel with only one motor.
I know it can be done and I should practice more but your comment is noted, thank you.


Other things can be raw water impeller, heat exchanger, hoses, thru hull. Still not seeing the head gasket looking at video.
Yes, please see my post just above I just adressed these items. Thank you
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Old 05-20-2021, 06:32 PM   #17
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Quote:
Originally Posted by Tom Foolery View Post
So, This is good question and Yes,
It did on two different occasions.

I warmed the motors as usual for about half an hour before going underway, leaving the marina operating temps approx. 120f, (Normal)
then while underway (idling) after leaving the marina and bumping up the RPM easily outside of the no wake zone (never aggressively or excessively,
the Overheating alarm sounded and the temp gauge showed 220f (ish)

I immediately shut it down and left the other motor running to get me back to my dock,

I went below and my catch basin was FULL of Coolant and Water and the Reservoir was empty.
So here is my view.

(a) Perhaps some good news - I listened to the video you posted and the engine sounded pretty normal even after overheating. I experienced a scored #6 cylinder after a mild overheat following work from a local mechanic. We ended up with piston slap that was quite obvious - I didn't hear that on your video, so hopefully that is good news.

(b) If the engine overheated and pushed coolant out I suspect you need to do the fill/bleed cycle a few times to get all the air out as was suggested above.

Bottom line though - you need to look in to why the engine overheated - start with the raw water system and look at the heat exchanger for sure.
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Old 05-20-2021, 06:45 PM   #18
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Quote:
Originally Posted by hobbystuff View Post
So here is my view.

(a) Perhaps some good news - I listened to the video you posted and the engine sounded pretty normal even after overheating. I experienced a scored #6 cylinder after a mild overheat following work from a local mechanic. We ended up with piston slap that was quite obvious - I didn't hear that on your video, so hopefully that is good news.

(b) If the engine overheated and pushed coolant out I suspect you need to do the fill/bleed cycle a few times to get all the air out as was suggested above.

Bottom line though - you need to look in to why the engine overheated - start with the raw water system and look at the heat exchanger for sure.
That is what I saw and heard. Tom is ready to do a test run under load after another air bleed and fill. Again watch those rad caps, mine were replaced when I could not find any reason for water loss and now no water loss. They are only 4lb rad caps
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Old 05-20-2021, 07:18 PM   #19
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Originally Posted by Soo-Valley View Post
That is what I saw and heard. Tom is ready to do a test run under load after another air bleed and fill. Again watch those rad caps, mine were replaced when I could not find any reason for water loss and now no water loss. They are only 4lb rad caps
Thanks, I'll give it GO and Let Ya'll know.
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Old 05-20-2021, 07:20 PM   #20
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Reply in red below:

Quote:
Originally Posted by hobbystuff View Post
So here is my view.

(a) Perhaps some good news - I listened to the video you posted and the engine sounded pretty normal even after overheating. I experienced a scored #6 cylinder after a mild overheat following work from a local mechanic. We ended up with piston slap that was quite obvious - I didn't hear that on your video, so hopefully that is good news.I'd say THIS is good news yes.

(b) If the engine overheated and pushed coolant out I suspect you need to do the fill/bleed cycle a few times to get all the air out as was suggested above.
Noted and thanks!

Bottom line though - you need to look in to why the engine overheated - start with the raw water system and look at the heat exchanger for sure.
Noted and will do. Thanks
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