Tracy D'arth Posted July 28, 2021 Report Share Posted July 28, 2021 I have often found the fins on the cylinders full of oily rubbish which plays havoc with the cooling. Link to comment Share on other sites More sharing options...
Tony Brooks Posted July 28, 2021 Report Share Posted July 28, 2021 1 minute ago, Tracy D'arth said: I have often found the fins on the cylinders full of oily rubbish which plays havoc with the cooling. Agreed, but not so sure on a sea boat. Anyway, the marine manual showed the tools you need to clean them and says it is routine maintenance. Link to comment Share on other sites More sharing options...
nb Innisfree Posted July 28, 2021 Report Share Posted July 28, 2021 Late mate of mine had a diesel tractor (Ford son Major) It had a throttle valve like a petrol engine, it was mounted in a box bolted to the air inlet and throttle lever went to that instead of fuel pump. One day we decided to adjust the valves and removed the throttle housing to gain easier access, all went well until we tried to turn the engine a bit with the starter motor - no throttle valve to hold it back! - panic as engine roared straight to max revs, mate gesticulating for me to shut down fuel pump, blank look from me so he had to run round and do it. God knows how many revs were reached but there was a lot of noise and smoke (we had also removed the silencer) It ran beautifully after that, cleared a few cobwebs I think. Link to comment Share on other sites More sharing options...
Tony Brooks Posted July 28, 2021 Report Share Posted July 28, 2021 5 minutes ago, nb Innisfree said: Late mate of mine had a diesel tractor (Ford son Major) It had a throttle valve like a petrol engine, it was mounted in a box bolted to the air inlet and throttle lever went to that instead of fuel pump. One day we decided to adjust the valves and removed the throttle housing to gain easier access, all went well until we tried to turn the engine a bit with the starter motor - no throttle valve to hold it back! - panic as engine roared straight to max revs, mate gesticulating for me to shut down fuel pump, blank look from me so he had to run round and do it. God knows how many revs were reached but there was a lot of noise and smoke (we had also removed the silencer) It ran beautifully after that, cleared a few cobwebs I think. That is a pneumatic governor, and uses the depression caused by a venturi acting against a diaphragm to control the pump. Rather a stupid idea in my view, but I think it might have been to get around a patent. The throttle butterfly and venturi (be it a very small one) did nothing to help such engine's fuel economy or their emissions. They will also do that if the pipe running from the venturi to the diaphragm chamber breaks. Link to comment Share on other sites More sharing options...
David Mack Posted July 28, 2021 Report Share Posted July 28, 2021 29 minutes ago, nb Innisfree said: Late mate of mine had a diesel tractor (Ford son Major) It had a throttle valve like a petrol engine, it was mounted in a box bolted to the air inlet and throttle lever went to that instead of fuel pump. One day we decided to adjust the valves and removed the throttle housing to gain easier access, all went well until we tried to turn the engine a bit with the starter motor - no throttle valve to hold it back! - panic as engine roared straight to max revs, mate gesticulating for me to shut down fuel pump, blank look from me so he had to run round and do it. God knows how many revs were reached but there was a lot of noise and smoke (we had also removed the silencer) It ran beautifully after that, cleared a few cobwebs I think. You don't want a big diesel running away: 1 Link to comment Share on other sites More sharing options...
Roxylass Posted July 28, 2021 Author Report Share Posted July 28, 2021 Not a lot of room Link to comment Share on other sites More sharing options...
Tony Brooks Posted July 30, 2021 Report Share Posted July 30, 2021 Sorry to revive this topic, but does the SR 2 have a cooling air baffle that can be fitted upside down so a cylinder overheats? This is a known problem on some of the multi-cylinder air cooled Lisiers. Link to comment Share on other sites More sharing options...
Roxylass Posted August 21, 2021 Author Report Share Posted August 21, 2021 Took the engine box off and made sure that the engine was getting plenty of cooling air i will try to post some photos later. Took a run to rosyth dockyard on the water roughly three miles not even half throttle i have fitted the canvas that I bought from primrose engineering thanks sue Plenty heat exiting from it also blue smoke circulating around the engine box engine hot to touch but didn’t cut out this time when I put it to idle starting to think now that it could be the fins needing cleaning i have had the exhaust and inlet manifold off can only see a bit of the fins cant seem to be able to remove the air baffles Do the cylinder heads have to come off to carry out this operation Link to comment Share on other sites More sharing options...
Tony Brooks Posted August 21, 2021 Report Share Posted August 21, 2021 (edited) 15 minutes ago, Roxylass said: Took the engine box off and made sure that the engine was getting plenty of cooling air i will try to post some photos later. Took a run to rosyth dockyard on the water roughly three miles not even half throttle i have fitted the canvas that I bought from primrose engineering thanks sue Plenty heat exiting from it also blue smoke circulating around the engine box engine hot to touch but didn’t cut out this time when I put it to idle starting to think now that it could be the fins needing cleaning i have had the exhaust and inlet manifold off can only see a bit of the fins cant seem to be able to remove the air baffles Do the cylinder heads have to come off to carry out this operation Our SL manuals had diagrams of the hooks that were to be used for cleaning the fins by just taking the cooling air outlet side cover off, but I still wonder about the possibility of having an air directing baffle fitted upside down, so one cylinder is not being cooled properly. If this is the case, the heads will have to come off. This file:///tmp/LR%20&%20SR%201,2,3%20Industrial%20MPM%20027-08013.pdf suggest it does have a baffle but no illustration. Incorrectly fitted baffles are a known cause of problems. Edited August 21, 2021 by Tony Brooks Link to comment Share on other sites More sharing options...
Roxylass Posted August 21, 2021 Author Report Share Posted August 21, 2021 Oh well I have a torque wrench and the sr2marine manual pity there wasn’t somebody near me that knew what they were doing thanks again for the good advice Tony Link to comment Share on other sites More sharing options...
Tony Brooks Posted August 21, 2021 Report Share Posted August 21, 2021 12 minutes ago, Roxylass said: Oh well I have a torque wrench and the sr2marine manual pity there wasn’t somebody near me that knew what they were doing thanks again for the good advice Tony On no account fully tighten the heads down until you have fitted and tightened the manifolds, give the heads a chance to twist as you tighten the manifolds. Tightening the heads first has been known to crack manifolds when the heads were slightly twisted. Treat the injector leak off pipe system gently, I would be inclined to anneal it before refitting, but take are not to melt the braze on the joints. 1 Link to comment Share on other sites More sharing options...
Roxylass Posted August 21, 2021 Author Report Share Posted August 21, 2021 10 minutes ago, Tony Brooks said: Does all this side have to come off also Link to comment Share on other sites More sharing options...
Tony Brooks Posted August 21, 2021 Report Share Posted August 21, 2021 14 minutes ago, Roxylass said: Does all this side have to come off also Sorry, don't know. I would have to look. Link to comment Share on other sites More sharing options...
Tracy D'arth Posted August 21, 2021 Report Share Posted August 21, 2021 I think so, its 30 years or so since I pulled one apart. Its only machine screws anyway, means that you can clean it all up. Heed Tony's advice, tighten nothing until the heads and manifolds have been loosely mounted, then go round and tighten all up progressively a little at a time. Link to comment Share on other sites More sharing options...
Roxylass Posted September 5, 2021 Author Report Share Posted September 5, 2021 Hopefully should be okay for air now One more Link to comment Share on other sites More sharing options...
Tony Brooks Posted September 5, 2021 Report Share Posted September 5, 2021 I hope so as well, but am still bothered about no comments on any air duct between the cylinders. Link to comment Share on other sites More sharing options...
Roxylass Posted September 5, 2021 Author Report Share Posted September 5, 2021 Tony she will be put on a hard standing end of this month good couple of hours running today in the river forth every half hour touched the rocker covers they were just a nice warm got back to the moorings idling as it should pulled the engine stop touched the rockers five minutes later to hot to touch heads will be coming off and fins cleaned in a ultrasonic cleaner is there a diagram anywhere showing how the baffles should sit thanks for your advice Link to comment Share on other sites More sharing options...
Tony Brooks Posted September 5, 2021 Report Share Posted September 5, 2021 9 minutes ago, Roxylass said: Tony she will be put on a hard standing end of this month good couple of hours running today in the river forth every half hour touched the rocker covers they were just a nice warm got back to the moorings idling as it should pulled the engine stop touched the rockers five minutes later to hot to touch heads will be coming off and fins cleaned in a ultrasonic cleaner is there a diagram anywhere showing how the baffles should sit thanks for your advice I think there was in our SL4 manuals, but I have not seen any in the common SL/SR manual. If you have one in a twin, then I think it might be possible to work it out by eye, otherwise a PM to RLWP or Bizzard once you have access should provide a definitive answer. Link to comment Share on other sites More sharing options...
Roxylass Posted September 5, 2021 Author Report Share Posted September 5, 2021 Two gents who will certainly know again many thanks Tony Link to comment Share on other sites More sharing options...
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