Pearson 365 and 367

Hi again, I've been trying to work on the things you told me like the priming issue, but still with no luck. The stop handle looks like it's all the way in, maybe I'll have to open it and confirm. Talking with the mechanic, he asked me if there was a way to measure the compression, so I've come here to ask since I don't know the answer.

Again, thanks in advance for the help.
Gabriel

Hi thanks for the quick reply. My bad when I mentioned rubber I was trying to refer to the rings that go around the piston head. Thanks for clearing the degreaser issue. The first two times the engine started it ran for about a minute or so and we turned it off because we were not sure if it was lubricating correctly and because we hadn't put water and coolant in the system. First we thought it was getting the water through the head gasket, that's why it was bought new. Then it kept mixing water so we thought it was the raw water pump which was replaced. After that it kept mixing water so we went and checked the oil cooler which in fact was mixing water and oil so I had it replaced.

The boat is located in Puerto Rico, it's always over 70 deg F here. Still we have tried using the pre heater to help the engine start but not much has been accomplished.

I did not know about the back flooding issue, it has been cranked for a while with the raw water on so there might be a real possibility that the water has built up enough to backflow. I'll be checking that today. Any advice on how to drain or empty the water that has built up?

Thanks a lot Dale!

Gabriel

Short story: Engine has been 50% rebuilt and it will crank but won't start.

Long story: Since the last time my westerbeke 4-108 was used and died on me because it was mixing oil and water, I have bought and installed the following parts:
Head fixed at the machine shop
New head gasket
New rocker cover & gasket
New racor filter
New oil filter
new fuel filter
new raw water pump
starter was fixed and rebuilt
new 12v pre pump for diesel
injectors repaired at the machine shop
old diesel was removed and put in new diesel
old oil was removed and put in new oil
added additives to the diesel and to the oil
Now the engine has been put back, diesel lines have been bled and it has started only three times so far. Twice on one day and a third time another day. The third and last time it started and died less than a minute after. After that I have not been able to start the engine again, it does turn and crank but it won't fire, sometimes it does get close to starting but it doesn't. I'm asking for any help or advise on how to get it going since me and the mechanic are going mad trying to find what's wrong.
My only guess would be that the rings on the pistons got wrecked. When the water and oil got really mixed the day it died the mechanic threw some degreaser in the engine with the oil so it would weaken and remove the sludge from inside the engine, after that a friend advised me that the degreaser would basically dissolve the rubber on the pistons leading to compression problems. I don't know much about mechanics so I don't how true that could be, if anyone knows I would greatly appreciate their input or feedback. I believe it is the only thing we have not changed, checked nor repaired since it would require for the engine to be dismantled.
Any information, advice or trick regarding this problem of the engine cranking but not starting will be greatly appreciated, it's been 6 months of no sailing due to this engine not functioning. 
Thanks in advance.
Gabriel

I just measured them and it looks like they are 3/8 but my measuring tape only has 1/8 markers and the difference is so little I can't tell for sure. I looked at lift pump area and after removing a cover I finally found a "long" number. I'm attaching the picture to see if you can identify it. But it does not look like a serial number. It looks more like a part number. It ends with -01 but it can't be seen in the picture. Thank you so much, you have helped me a lot!

Thanks again for the info. Well now I have 2 different opinions so I'll have to take another look and make a guess. If I measure the head studs I should be able to make which model is it for sure? I also have a picture of the top of the cylinders which I'll attach. Also found a number near the lift pump which I took a picture also, but it does not look like the serial number.
Thanks Dale

Hi Dale thanks a lot for such a quick reply. I have more pictures of the engine, I'll attach them on this post. I'm not well versed with diesel engines so sometimes I end up taking pictures of the wrong part 😬. Regarding the engine number I have looked all around the engine and can't seem to find any number, it may be what you said that is obscured by a filter (I took it out recently, so Ill take another look at the area) or I'm thinking that the previous owner just sprayed paint over it because I've really spent at least half an hour looking for a number and nothing. Yesterday I talked with a salesman from Transatlantic diesel who tried to identify the engine but wasn't sure, he was leaning towards a 108 but wasn't 100% sure. He told me to take pictures of the lift pump, the injector pump and the exhaust manifold which I'll attach here. I can take more pictures of it if that helps.
Also it is the first time I hear  of the 4.99 model.
Again thanks a lot, I really appreciate the help.

Hi everyone, I'm new to the forum. Just bought a 1980 365 ketch in July. They sold it to me as if the engine was running alright,  but on the first sail it turned off and died. Apparently it overhated and blew the head gasket. I am currently trying to repair it. I first ordered the gaskets directly from Westerbeke which still haven't arrived since they do not have them in stock. All the gaskets from the top part of the engine came to a total of around $620 without shipping (which can be plenty since I live in Puerto Rico 🇵🇷). After that I learned that the westerbeke engine is the same as the perkins 4.107/4.108. And the gasket set for the perkins engine is around 60-100 without shipping, which is way better. But I cannot seem to find any serial o model number on my engine, so I am not sure if my Westerbeke is a 4-107 or a 4-108, due to this I'm stuck with the whole repair. Does anyone know if the 1980 365 came with a 4-107 or a 4-108, I know that one has dry cilinders and the other one not, but I don't know any other way to identify which one is it. I have plenty of pictures if that helps.
Thanks in advance
Gabriel