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Engines / SR3 Rebuild
« on: February 02, 2023, 06:49:51 AM »
Hi all! Only just joined so be gentle with me 
Background
I recently bought an old Ketch which was fitted with a Lister SR3 engine that was working, albeit by a wing and a prayer, that then died in much the same way as the Bluesmobile did near the end of the movie. There was a loud crunch just as I was maneuvering the boat in position under the shiplift. During the initial restart I did manage to get it running again for a very short time until it became clear that all was not well. Upon inspection of the sump i found bits on the camshaft which apparently is not good!
My experience in mechanictary is less than zero, by which I mean I don't know what I don't know, however I did know a real marine mechanic who fell in love with the old motor and told me that if I could, I should keep it and rebuild it. So i armed with a shiny new spanner I set about stripping it down. For lots of details and photos please visit my blog myketchlife.com and click on the Engine Bay topic.
The engine is back together but obviously won't start because I'm still not a mechanic, however it does turn over nicely but is not firing at all which i believe is a fuel issue.
I had stripped down and cleaned the injectors during the rebuild, tried a couple of different methods of priming the fuel system and turned over the motor without the injectors connected as I don't have a spare pipe which is needed to prove the injectors out in the open (according to the parts manual I have). There didn't seem to be much fuel coming from the 2 of the fuel pumps and none coming from the third. As I had already proved that all the fuel lines are clear I stripped down the fuel pumps but cannot reinstall them yet as I am waiting on a new fuel delivery Vv as there was one missing! Also I am getting a complete new fuel filter as the original was only cleaned not replaced due to the age of the and unavailability of a replacement filter. Sorry about the long winded blurb but I was trying to think of what questions I may get asked.
Questions for the Brains Trust
Once I have the part and have re-installed the 3 pumps what is the best method of priming?
How much fuel should be coming from a fuel pump on each stroke?
I am unable to prove the fuel timing as there is no mark visible on The fly wheel so if this is the problem how do I fix the timing?
Is there anything else I should check before I do a restart?
Thanks in advance
myketchlife.com
Background
I recently bought an old Ketch which was fitted with a Lister SR3 engine that was working, albeit by a wing and a prayer, that then died in much the same way as the Bluesmobile did near the end of the movie. There was a loud crunch just as I was maneuvering the boat in position under the shiplift. During the initial restart I did manage to get it running again for a very short time until it became clear that all was not well. Upon inspection of the sump i found bits on the camshaft which apparently is not good!
My experience in mechanictary is less than zero, by which I mean I don't know what I don't know, however I did know a real marine mechanic who fell in love with the old motor and told me that if I could, I should keep it and rebuild it. So i armed with a shiny new spanner I set about stripping it down. For lots of details and photos please visit my blog myketchlife.com and click on the Engine Bay topic.
The engine is back together but obviously won't start because I'm still not a mechanic, however it does turn over nicely but is not firing at all which i believe is a fuel issue.
I had stripped down and cleaned the injectors during the rebuild, tried a couple of different methods of priming the fuel system and turned over the motor without the injectors connected as I don't have a spare pipe which is needed to prove the injectors out in the open (according to the parts manual I have). There didn't seem to be much fuel coming from the 2 of the fuel pumps and none coming from the third. As I had already proved that all the fuel lines are clear I stripped down the fuel pumps but cannot reinstall them yet as I am waiting on a new fuel delivery Vv as there was one missing! Also I am getting a complete new fuel filter as the original was only cleaned not replaced due to the age of the and unavailability of a replacement filter. Sorry about the long winded blurb but I was trying to think of what questions I may get asked.
Questions for the Brains Trust
Once I have the part and have re-installed the 3 pumps what is the best method of priming?
How much fuel should be coming from a fuel pump on each stroke?
I am unable to prove the fuel timing as there is no mark visible on The fly wheel so if this is the problem how do I fix the timing?
Is there anything else I should check before I do a restart?
Thanks in advance
myketchlife.com