ian201 Posted February 17, 2014 Share Posted February 17, 2014 Hi chaps, I am looking for some help, we have been having some problems with my mates Mutt, some time ago it started only wanting to start using easy start. At that time we stripped and refurbished the carb. this made no difference. So we then pulled the motor out stripped down and checked all the components cleaned and rebuilt it, nothing obvious was found. The head was refurbished. Fuel tank drained and fresh fuel in place and the motor will still not start without easy start, once running it will rev and idle fine. If turned off there is no guarantee it will re start even when hot but give it some easy start and off it goes. Things of note timming checked and re checked air leaks looked for starter motor seams slow compared with my Hotchkiss ( both 24v) When turned off fuel can drip from the carb ( no filter on at the moment) Spark seams good. Any advice would be much appreciated best regards ian Quote Link to comment Share on other sites More sharing options...
WCMatt Posted February 18, 2014 Share Posted February 18, 2014 Wonder if you have a bad coil? For all things g838 related I recommend this site: www.g838.org Very helpful bunch of guys over there. Sorry I couldn't be of more help, good luck! Matt Quote Link to comment Share on other sites More sharing options...
Starfire Posted February 18, 2014 Share Posted February 18, 2014 Weak spark does sound like a suspect. Check your plugs, leads, coil and breaker(s). When you rebuilt the engine, did you have it compression tested? Cheers, Terry Quote Link to comment Share on other sites More sharing options...
ian201 Posted February 18, 2014 Author Share Posted February 18, 2014 Many thanks for your thoughts, we are putting this question up on the G838 forum too, it's a good question re the coil. It has an electronic ignition distributor (original equipment), could do with a spare to swap out and try. Last year we did a compression test before we pulled the motor out but I cannot recall the results, if it was bad though we would have had bored the block. I will do a compression test again this week to get info. Thanks again Terry & Matt Ian Quote Link to comment Share on other sites More sharing options...
sirhc Posted February 18, 2014 Share Posted February 18, 2014 Hi Ian, Mine is a lazy starter too. If it's not been run for more than a few hours it seems to want to turn over for several minutes before it fires, unless I use easy start. It always fires on the first turn with some easy start . Once it's going it's fine, it'll fly down the road at 60+ and never misses a beat. I've got another fuel pump to try to see if it solves it. Is this one an A2 with the emission control system fitted? Mine is and I've often wondered if the fuel is draining back to the tank through all the pipes! Chris Quote Link to comment Share on other sites More sharing options...
ian201 Posted February 18, 2014 Author Share Posted February 18, 2014 Thanks Chris, no its a normal 151 not A2. It sounds very a similar situation, although I have not taken it out on the road all indications are good once started and from what I recall it would fly down the road (last year before we pulled engine out). Ian Quote Link to comment Share on other sites More sharing options...
WCMatt Posted February 18, 2014 Share Posted February 18, 2014 M151 & M151A1s both had electric in tank fuel pumps. However, a mechanical fuel pump can be fitted to the block (quite easily) if nessasary. Matt Quote Link to comment Share on other sites More sharing options...
ian201 Posted February 18, 2014 Author Share Posted February 18, 2014 Hi Matt, we had considered this but the electric pump seams to work well and will empty the tank quickly when on full flow. It is interesting that Chris has a similar problem and I am now wondering if the starter is not turning it over fast enough to pull a decent vacum through the carb ?. Ian Quote Link to comment Share on other sites More sharing options...
ian201 Posted February 18, 2014 Author Share Posted February 18, 2014 Matt, just a thought about the fuel pump. It used to turn off when the pressure was reach in the feed to carb but it has not been doing that in recent times, in fact I cannot remember the last time in did shut down on its own, I guess the way test this as a problem to starting would be to disconnect the pump and go for an engine start ?. Ian Quote Link to comment Share on other sites More sharing options...
WCMatt Posted February 19, 2014 Share Posted February 19, 2014 Ian I don't want to give you bad advice so I'll refraine from (attempting to) answering your last question. Best advice I can give is to post such questions over on the G838 forum as there's enough old "mutt jockeys" over there who can answer just about any conceivable question you might have with regard to the M151 series 1/4 ton. As for the "lazy" starter, I'd check to make sure all electrical connections were both clean & tight. Might help, couldn't hurt. Matt Quote Link to comment Share on other sites More sharing options...
ian201 Posted February 19, 2014 Author Share Posted February 19, 2014 Thanks Matt, it's going on to the 838 forum today hopufully Best Regards ian Quote Link to comment Share on other sites More sharing options...
muttguru Posted February 28, 2014 Share Posted February 28, 2014 Ian, there are several potential causes of your problem. The two that spring to mind are:- 1. Fuel draining back into the tank, leaving the fuel line and carb dry. 2. Batteries too low to turn over the engine fast enough to "catch"..... low batteries will use most of the remaining power to crank the engine, leaving insufficient power to provide a spark at the plugs. It could be low batteries or it could be poor earth connections...look especially at the battery cable -to-battery-compartment connection. The cable bolts to the inner wall of the battery box and it MUST have a bright, clean connection. Likewise the battery terminals must be clean and fairly tight. You should also ensure that the cable which grounds the engine to the body is in place and, once again, is clean and tight. This cable runs from under the horn to the motor......make sure it's there ! I have a "troubleshooter" chart which takes you step-by-step through potential problems. If you want a copy, email me directly. Kind regards.... Ken muttguru@aol.com Quote Link to comment Share on other sites More sharing options...
ian201 Posted February 28, 2014 Author Share Posted February 28, 2014 Hi Ken, email just sent. best Regards ian Quote Link to comment Share on other sites More sharing options...
R Cubed Posted March 10, 2014 Share Posted March 10, 2014 Hi Ian, try checking the voltage at the coil while cranking the engine over this can give a good indication of how the coil might perform under cranking conditions. Good luck If only thats all i had to worry about Quote Link to comment Share on other sites More sharing options...
ian201 Posted March 10, 2014 Author Share Posted March 10, 2014 Hi Richard, thanks for your thoughts, we are playing with earths at the moment and having the starter re built to rule these out. If this has no affect it's on to the ignition. It's fitted with the electronic ignition which makes it more challenging to check stuff. ian Quote Link to comment Share on other sites More sharing options...
ian201 Posted March 29, 2014 Author Share Posted March 29, 2014 Starting problem update. New engine earths and new starter fitted and problem sorted, starter turns over much faster and motor fires up first push of the button. Thanks for all thoughts on the problem Ian Quote Link to comment Share on other sites More sharing options...
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