Okay, I'm new to this small diesel stuff. Now have a Hunter 27' 1982 with clean great running Yanmar 8. Where and how do I find an air filter for this critter? Previous owner had a need to spray starter fluid in the air intake and I think the air filter doesn't exist anymore. Also, there is no 'choke' on this critter that I can find. What is the secret to cold start ups? And finally I need to tighten the throttle control cable so that it will not slip back to idle on its own.
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W
Ward
part numbers
here is a web link for Yanmar which has all part numbers for filters etc. Ward http://www.yanmar.com/parts/marine.html
here is a web link for Yanmar which has all part numbers for filters etc. Ward http://www.yanmar.com/parts/marine.html
S
Steve O.
yanmar8
for air filter Yanmar direct at www.torresen.com DO NOT use starter fluid or or WD-40 or you will be replacing the engine instead of just the air filter. Yanmar has no choke and no glow plugs. Try advancing the throttle to 3/4 full and back down as soon as it catches fire, don't over-rev it.
for air filter Yanmar direct at www.torresen.com DO NOT use starter fluid or or WD-40 or you will be replacing the engine instead of just the air filter. Yanmar has no choke and no glow plugs. Try advancing the throttle to 3/4 full and back down as soon as it catches fire, don't over-rev it.
Primary for noise reduction.
Blume: If you find a local Yanmar dealer, they can order this part for you. The primary reason for the airfilter is for noise reduction. If you cannot find a dealer, look up the distributor in your area on the Yanmar site. They can either point you to someone or ship direct.
Blume: If you find a local Yanmar dealer, they can order this part for you. The primary reason for the airfilter is for noise reduction. If you cannot find a dealer, look up the distributor in your area on the Yanmar site. They can either point you to someone or ship direct.
M
Mark S
REALLY IMPORTANT NOT TO USE STARTING FLUID!!
You can blow the head gasket real quick like that! That might be why the 8hp is hard to start.
You can blow the head gasket real quick like that! That might be why the 8hp is hard to start.
M
Mike
OH NOOOOO
Starting fluid is very bad on these diesals as stated in an earlier response you can do serious damage by using a starting aid, advancing the throttle should be all you need to do. If that does not work, it's time for a tune up and maybe some new injectors...as far as the air filter only being for quietness...totally incorrect... for everyone gal of fuel a diesal engine will use approx. 10,000 gal of air so if you don't filter it you can cause scoreing and excessive carbon build up form foriegn matter entering the engine via the air intake.....so air filter MOST IMPORTANT... Any questions feel free to cantact me. mikemm@starband.net Mike
Starting fluid is very bad on these diesals as stated in an earlier response you can do serious damage by using a starting aid, advancing the throttle should be all you need to do. If that does not work, it's time for a tune up and maybe some new injectors...as far as the air filter only being for quietness...totally incorrect... for everyone gal of fuel a diesal engine will use approx. 10,000 gal of air so if you don't filter it you can cause scoreing and excessive carbon build up form foriegn matter entering the engine via the air intake.....so air filter MOST IMPORTANT... Any questions feel free to cantact me. mikemm@starband.net Mike
F
Fred
Starting fluid on Diesels
Starting fluid can be very hard on a diesel. If you need to use starting fluid in 50* temps and above there is a low compression problem or the injector nozzles are not atomizing the fuel well. (shooting a stream rather than a spray.) Unless of coarse your engine uses glow plugs and they are not working. A diesels governor has the pump in max fuel position when the engine is not running, the governor pulls back according to the desired throttle position when it starts. So you are in max fuel when starting. The nozzles can be exchanged for rebuilt ones at an autherized Robert Bosch distributor / repair station. DO NOT GET NOZZLES FROM YANMAR. You will pay much more for the exact same thing. Look in the yellow pages for Diesel engine fuel system repair. They can rebuild yours, They replace the nozzel tips with new ones. If you have a low compression problem, its probabley in the cylinder head. Yanmar's intake and exhaust valves are notorious for wear. A valve job with new valves would solve that problem. The cylinder head is the weak link in an other wise excellent engine. Last thing, make certain your starting system is in good order. A slow turing engine will be harder to start. We create heat as we compress the air, the faster you spin the engine the more heat you create. Low compression usually shows up as white / light gray smoke upon and just after start up. Fred
Starting fluid can be very hard on a diesel. If you need to use starting fluid in 50* temps and above there is a low compression problem or the injector nozzles are not atomizing the fuel well. (shooting a stream rather than a spray.) Unless of coarse your engine uses glow plugs and they are not working. A diesels governor has the pump in max fuel position when the engine is not running, the governor pulls back according to the desired throttle position when it starts. So you are in max fuel when starting. The nozzles can be exchanged for rebuilt ones at an autherized Robert Bosch distributor / repair station. DO NOT GET NOZZLES FROM YANMAR. You will pay much more for the exact same thing. Look in the yellow pages for Diesel engine fuel system repair. They can rebuild yours, They replace the nozzel tips with new ones. If you have a low compression problem, its probabley in the cylinder head. Yanmar's intake and exhaust valves are notorious for wear. A valve job with new valves would solve that problem. The cylinder head is the weak link in an other wise excellent engine. Last thing, make certain your starting system is in good order. A slow turing engine will be harder to start. We create heat as we compress the air, the faster you spin the engine the more heat you create. Low compression usually shows up as white / light gray smoke upon and just after start up. Fred
Starting Fluid
I want to begin by saying Fred's response is right on target, recommend you follow his guidance, if you are not sure you might want to replace your diesel fuel, replace with #1 diesel if you can get it. Most probably Fred is right. I manage contracts for the Army . We rebuild and dyano about 700 - 1k diesel engines each year, all sizes/types. The number one cause of bent rods and blown heads is lack of PM/ preventive maintenance thus resulting in the use of starting fluid which reslults in the above. If you don't bend the rod from excessive chamber pressure from the too much starting fluid it will when the head gasket blows and water leaks into the cylinder chamber, water will not compress so the rod bends. The only time we use starting fluid is for recovery of vehicle from a field enviroment that has problems we cannot fix on site and only highly trained personnel are allowed to use the fluid or in emergency situations. If regular preventive maintenance schedules are followed and fix the problems as they occur without using additives such as starting fluid it will be alot less expensive in the long run. Replace those injectors and head gaskets if necessary, replace that fuel filter,etc's its cheaper than a whole engine rebuild or worse replacement. If you don't have a service manuel recommend you get one from yanmar you won't regret it! I my busines starting fluid cost millions of dollars, amazing how much damage a cheap can of fluid can do. Good luck and Merry Christmas! Jim
I want to begin by saying Fred's response is right on target, recommend you follow his guidance, if you are not sure you might want to replace your diesel fuel, replace with #1 diesel if you can get it. Most probably Fred is right. I manage contracts for the Army . We rebuild and dyano about 700 - 1k diesel engines each year, all sizes/types. The number one cause of bent rods and blown heads is lack of PM/ preventive maintenance thus resulting in the use of starting fluid which reslults in the above. If you don't bend the rod from excessive chamber pressure from the too much starting fluid it will when the head gasket blows and water leaks into the cylinder chamber, water will not compress so the rod bends. The only time we use starting fluid is for recovery of vehicle from a field enviroment that has problems we cannot fix on site and only highly trained personnel are allowed to use the fluid or in emergency situations. If regular preventive maintenance schedules are followed and fix the problems as they occur without using additives such as starting fluid it will be alot less expensive in the long run. Replace those injectors and head gaskets if necessary, replace that fuel filter,etc's its cheaper than a whole engine rebuild or worse replacement. If you don't have a service manuel recommend you get one from yanmar you won't regret it! I my busines starting fluid cost millions of dollars, amazing how much damage a cheap can of fluid can do. Good luck and Merry Christmas! Jim
B
Blume
thanks for help with Yanmar
thanks for all the help. I had looked at the archives and found another suggestion too. that is turn the engine over for a short time and then let it sit for about a minute to let the cylinders heat up. I tried this this past Sunday with a cold (probably 45 degree) engine and the little bugger fired up on the third try. I was also trying to start it on full throtle... 1/2 to 2/3 is better. I've also got two batteries now and that might help with the cranking 'speed'. Anyone know how to tighten the throtle cable?
thanks for all the help. I had looked at the archives and found another suggestion too. that is turn the engine over for a short time and then let it sit for about a minute to let the cylinders heat up. I tried this this past Sunday with a cold (probably 45 degree) engine and the little bugger fired up on the third try. I was also trying to start it on full throtle... 1/2 to 2/3 is better. I've also got two batteries now and that might help with the cranking 'speed'. Anyone know how to tighten the throtle cable?
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