Martinb Posted May 6, 2018 Report Share Posted May 6, 2018 Hi We have a lister sr3 in our NB and have recently had a service. We have only in the last few weeks been able to take her out but have noticed when the engine has warmed up she has a habit of stalling when changing between forward and reverse I.e when putting into neutral. Not all the time but enough for it to be annoying and normally when approaching or in locks. She will start immediately no problem and will be fine until we need to do the same forward reverse actions. We are not mechanically minded so are at a loss as to the problem. We have noticed the idle speed does slow down when the engine is warm. It has been suggested we may have the wrong oil which is 10/40 but this appears to be divided. Any help or guidance much appreciated. Thanks Martin Link to comment Share on other sites More sharing options...
MtB Posted May 6, 2018 Report Share Posted May 6, 2018 3 minutes ago, Martinb said: We have noticed the idle speed does slow down when the engine is warm. It has been suggested we may have the wrong oil which is 10/40 but this appears to be divided. The oil grade will make no discernible difference to idle speed. If there is any difference at all it will be when cold. The idle speed slowing when warm seems odd though and is probably a clue. Somebody who understands the SR3 in depth will be along shortly with some more constructive comments than mine, I expect. Link to comment Share on other sites More sharing options...
RLWP Posted May 6, 2018 Report Share Posted May 6, 2018 It could be the idle speed, but if this is happening when warm I would want to know what gearbox the boat has Link to comment Share on other sites More sharing options...
bizzard Posted May 6, 2018 Report Share Posted May 6, 2018 (edited) This is it, init Richard, as far as stalling is concerned. If its an LH150 box it might be out of adjustment or low oil pressure causing the clutches late in letting go and touching foreward and astern at the same time. Is there clean Hypoy 80/90 oil in it. Edited May 6, 2018 by bizzard Link to comment Share on other sites More sharing options...
RLWP Posted May 6, 2018 Report Share Posted May 6, 2018 27 minutes ago, bizzard said: Is there clean Hypoy 80/90 oil in it. To the OP, i.e in the gearbox - not the engine Link to comment Share on other sites More sharing options...
Martinb Posted May 6, 2018 Author Report Share Posted May 6, 2018 It's a morse Link to comment Share on other sites More sharing options...
bizzard Posted May 6, 2018 Report Share Posted May 6, 2018 2 minutes ago, Martinb said: It's a morse Thats just the shift lever, they're nice. There should be a brass plate on top of the gearbox itself which probably says Lister LH150 on it. Link to comment Share on other sites More sharing options...
Arthur Marshall Posted May 6, 2018 Report Share Posted May 6, 2018 If it's of any help, my SR2 tickover slows down when the engine warms up. After various engineers had tangled with the engine and reset stuff, I've often had to adjust the tickover speed to make sure the engine didn't die in neutral. Link to comment Share on other sites More sharing options...
Martinb Posted May 6, 2018 Author Report Share Posted May 6, 2018 Thanks for the comments so far. As a complete novice how do we adjust the idle speed? Link to comment Share on other sites More sharing options...
MtB Posted May 6, 2018 Report Share Posted May 6, 2018 3 minutes ago, Martinb said: Thanks for the comments so far. As a complete novice how do we adjust the idle speed? It may sound trite to say, but getting hold of the manual for one's engine and reading it usually reveals answers to questions like this, along with reams of other stuff one didn't realise one wanted to know about it! Link to comment Share on other sites More sharing options...
Tony Brooks Posted May 6, 2018 Report Share Posted May 6, 2018 4 minutes ago, Martinb said: Thanks for the comments so far. As a complete novice how do we adjust the idle speed? You do not at present. You may well have an LH150 gearbox seeing the type of control you have so that may need checking. Although in this case it is less likely I would ask how full the sump is. These engines are very good at developing internal fuel leaks and when they do the oil level goes up and one symptom is stalling at idle when nice and hot. 2 minutes ago, Mike the Boilerman said: It may sound trite to say, but getting hold of the manual for one's engine and reading it usually reveals answers to questions like this, along with reams of other stuff one didn't realise one wanted to know about it! Including ow to adjust the gearbox and check the oil pressure if you have a gauge. Link to comment Share on other sites More sharing options...
RLWP Posted May 6, 2018 Report Share Posted May 6, 2018 35 minutes ago, Tony Brooks said: You do not at present. You may well have an LH150 gearbox seeing the type of control you have so that may need checking. I'd really like the answer to this - there are several ways to find the answer The simplest is to take a picture of the gearbox and post it here - if you don't know which bit is the gearbox a picture of the whole engine is helpful If there is a brass plate on top of the gearbox, that will help - especially if you can read it A description of the top of the gearbox is a reasonable start Richard Link to comment Share on other sites More sharing options...
Martinb Posted May 6, 2018 Author Report Share Posted May 6, 2018 Hopefully these help. Link to comment Share on other sites More sharing options...
Stilllearning Posted May 6, 2018 Report Share Posted May 6, 2018 It is an LH150 gearbox, as suspected. Now who can give the best written guide to gearbox fettling? Not me, BTW, I’ve forgotten how to do it. Link to comment Share on other sites More sharing options...
RLWP Posted May 6, 2018 Report Share Posted May 6, 2018 Excellent - just what we need You've got a Lister LH150 hydraulic gearbox. One of the features of this particular gearbox is it is designed to try to be in forward gear. You have to take action to pull it out of forward, in this case there's an oil pump pushing a piston to do that If it goes out of adjustment, it tries to be in forward gear. The same is true if there isn't enough oil, or the oil is old or the wrong type So, first off, check the oil level - there is a dipstick on the front, right hand side in front of the lever. If the oil isn't between the marks fill it up with EP80 gear oil If the oil level is correct, chances are the gearbox needs adjusting Richard Just now, Stilllearning said: It is an LH150 gearbox, as suspected. Now who can give the best written guide to gearbox fettling? Not me, BTW, I’ve forgotten how to do it. For what audience? Link to comment Share on other sites More sharing options...
Martinb Posted May 6, 2018 Author Report Share Posted May 6, 2018 Thanks....we will wait for the engine to cool and check. Will report back 1 Link to comment Share on other sites More sharing options...
Stilllearning Posted May 6, 2018 Report Share Posted May 6, 2018 7 minutes ago, RLWP said: Excellent - just what we need You've got a Lister LH150 hydraulic gearbox. One of the features of this particular gearbox is it is designed to try to be in forward gear. You have to take action to pull it out of forward, in this case there's an oil pump pushing a piston to do that If it goes out of adjustment, it tries to be in forward gear. The same is true if there isn't enough oil, or the oil is old or the wrong type So, first off, check the oil level - there is a dipstick on the front, right hand side in front of the lever. If the oil isn't between the marks fill it up with EP80 gear oil If the oil level is correct, chances are the gearbox needs adjusting Richard For what audience? For Martinb, mainly Link to comment Share on other sites More sharing options...
RLWP Posted May 6, 2018 Report Share Posted May 6, 2018 Just now, Stilllearning said: For Martinb, mainly Em - check the oil level, if that's OK get someone to adjust your gearbox for you Link to comment Share on other sites More sharing options...
MoominPapa Posted May 6, 2018 Report Share Posted May 6, 2018 1 hour ago, RLWP said: If it goes out of adjustment, it tries to be in forward gear. The same is true if there isn't enough oil, or the oil is old or the wrong type ....and if tries to be in forward gear at the same time it's still coming out reverse gear, that's what may stall the engine, because it stops the engine from turning. MP. Link to comment Share on other sites More sharing options...
RLWP Posted May 6, 2018 Report Share Posted May 6, 2018 How hot did you get this engine, it's taking a long time to cool down Link to comment Share on other sites More sharing options...
Martinb Posted May 6, 2018 Author Report Share Posted May 6, 2018 Sorry was moored up. Just checked it's on the max level. Link to comment Share on other sites More sharing options...
RLWP Posted May 6, 2018 Report Share Posted May 6, 2018 9 minutes ago, Martinb said: Sorry was moored up. Just checked it's on the max level. Right, I would say either your gearbox is out of adjustment or faulty. Start with the adjustment Are you mechanically adept? Richard 1 Link to comment Share on other sites More sharing options...
Martinb Posted May 6, 2018 Author Report Share Posted May 6, 2018 Um well if it it's something that can be done with instruction I am happy to give it a go otherwise no Link to comment Share on other sites More sharing options...
RLWP Posted May 6, 2018 Report Share Posted May 6, 2018 22 minutes ago, Martinb said: Um well if it it's something that can be done with instruction I am happy to give it a go otherwise no What needs doing is this: Take the top off (you'll need a new cover joint unless you are lucky) by taking out all the bolts on the top cover (1/2"AF, or 13mm spanners) There is a lever pushed by a piston on the left side of the gearbox. Push a screwdriver between the lever and the adjuster on the end of the piston. This will push the piston back in and oil will spill out of a hole at the back of the gearbox The gap between the two should be 3/32" (2.5mm) If it isn't loosen the lock nut and screw the adjuster until it is. You'll need two 1/2"AF spanners, a 3/4" AF spanner and three hands While you are in there, adjust the brake band for reverse. There is a threaded rod sticking up in the front, right corner with a slotted end and with a nut on it, all on the end of a round piston Loosen the nut, screw the thread out until the band is tight. Then screw the rod back in three full turns and tighten the nut Put the top back on making sure the sealing gasket is OK. If it is torn, it will leak and the gearbox won't work It isn't hard, if you have the confidence to do the job Richard 1 Link to comment Share on other sites More sharing options...
Martinb Posted May 6, 2018 Author Report Share Posted May 6, 2018 Thanks we will have a think if we can attempt it....Thanks for all your help and guidance Link to comment Share on other sites More sharing options...
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