[Blast Away]

I've spent money trying to resolve an issue with this engine.

It's had a new air filter, new fuel filter, new nozzle fitted to the injector, another fuel pump put on and the guys at the service shop still can't get it started.
There's compression there but it's just not having it.

Carl, can you solve the mystery?

I'm on the look out for another Yanmar now or may stump up and buy a new L100N for £1200.

[Matt Gibson]

Ive seen on ebay someone selling brandnew engine only yanmars. cant remember how much.

[BDCS]

If they have spent time working on the fueling then surely they must still think its a fuel issue. I'd start with the injector and make sure it pressures and atomises. Depending on what happens there then it will be an injection pump issue, I'd check the compression and engine timing - does it inject fuel just before TDC on the compression stroke ?
If you get stuck send it to me - a mate is coming somewhere North Tuesday to collect a bike.Matt can you post a link to those engines please as another mate has blown his kubota oc95

[Blast Away]

If they have spent time working on the fueling then surely they must still think its a fuel issue. I'd start with the injector and make sure it pressures and atomises. Depending on what happens there then it will be an injection pump issue, I'd check the compression and engine timing - does it inject fuel just before TDC on the compression stroke ?
If you get stuck send it to me - a mate is coming somewhere North Tuesday to collect a bike.Matt can you post a link to those engines please as another mate has blown his kubota oc95

Yeh I seen those on ebay a few weeks ago, they're not listed now but they're similar price to Seddons.

Injector nozzle was replaced by and tested by Hi Tech Diesel's and is fine.

Wouldn't know about that Carl to be honest.

It's a gamble taking it down mate and having to sort a courier to fetch it back up.

 does it inject fuel just before TDC on the compression stroke ?

[BDCS]

Yes. I'll not worked on these particular engines but the injector is piped so you can remove the injector and turn the pipe and refit the injector out of the engine, the injector should give a good mist in a burst. The injector should not dribble when the pressure is held but if its been tested it should be fine. The pump should have been tested with the injector because if its a fueling issue then that is the only other thing it can be - if the seals are shot then it will not develop pressure and hence inject at the injector. The pump looks to run directly off the cam so engine timing can be ruled out unless its stripped a tooth or more likely a woodruff key. This may still give compression but obviously would not start.

[Simon@ Clearview contractors]

My L100 is in at the moment, I knackered up the pull start a couple of weeks ago.
The guy at the machine shop said they were having problems getting it started, after a bit of tinkering he found that the valves were pitted, he's sorted that out and tells me it satrts fine off the pull..
Now all I need is the elecy start sorted...

[Matt Gibson]

Carl,

Like Lee said, those engines aren't listed anymore. But tell your mate to keep his eyes on ebay, I've seen those new Yanmar's for sale a couple of times now. Just the engine with electric start. Not sure on the type of shaft though.

[Blast Away]

Carl if it helps they held a propane torch towards the air intake last week and it eventually kicked over. This was before the injector went back in with replaced nozzle.

[BDCS]

I've never seen anyone doing that before, usually easy start. The fact remains that they have worked on the fueling but it still don't go. Squirt diesel at the right time with enough compression and it should go. Prove the fueling with the injector out of the engine - if it squirts then it will be either timing or a lack of compression.I can't believe they can't figure it out. Pour a little thick oil down the intake port to aid compression.

[Blast Away]

I've never seen anyone doing that before, usually easy start. The fact remains that they have worked on the fueling but it still don't go. Squirt diesel at the right time with enough compression and it should go. Prove the fueling with the injector out of the engine - if it squirts then it will be either timing or a lack of compression.I can't believe they can't figure it out. Pour a little thick oil down the intake port to aid compression.

They've said on a few occasions that easy start knackers the engine.

It deffo squirts after the pump before the injector. They reckon there's plenty of compression.

[BDCS]

East start will aid the start of an engine with a problem, it dosn't do them any favours but in this case it may show where the problem lies. I have heard people say engines become addicted to it but after all a worn engine will only get worse and not heal up. In this case it would give an idea of the problem. I'd whip the injector out and reconnect it with the pipe turned out of the engine because the pump may pump diesel at a low pressure ie with the pipe cracked but by-pass under full pressure when injecting. This would proove the fuel system. Some thick oil - a small cap full would boost compression which would proove the mechanical side if the fueling seems ok. If they have checked the injector ie crack off, pattern and holding then I'm thinking the pump seals. £70 off flea bay. Lee if they can't fix it they should either say "its because" or not charge you.

[Blast Away]

My brother in law has 2 diesel fitters on the sweepers, I'll get them to have a quick look, when I get chance too.

I'll try what you suggested with them and tell them the story so far.

Will update on this, may be of use to someone too in future if we get it going.

Cheers Carl

[chris scott]

Does it smoke when you turn it over? Saying it has enough compression is not enough...you need a compression tester. Did it start in the summer ok? (Warm weather) Does it start  and run ok when you give heat to the manifold..if so sounds like lack of compression ,rings worn bore...compression tester ..(take out injector put some oil down the bore) Have you checked the obvious like water in the fuel (water will not compress to inject....or burn for that matter!!) Blocked return or fuel filter .Take the injector pump off and test that. sorry i'm rambling.... My number is 07973216502 i am a mine of useless infomation about diesel engines....would you like to buy some smartseal products

[BDCS]

http://www.ebay.co.uk/itm/221169398754?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

[john mc kenna]

change the fuel in the tank just incase it is not what you think. just a thought.

[Blast Away]

change the fuel in the tank just incase it is not what you think. just a thought.

Fuel was changed mate with the new fuel filter.

[Nameless Drudge]

There are 3 yanmar cylinder heads on ebay,here`s 1,

http://www.ebay.co.uk/itm/Yanmar-L100-Cylinder-Head-/321043131534?pt=UK_BOI_Industrial_Tools_Generators_ET&hash=item4abfa96c8e

it just made me wonder do the cylinder heads have a common problem,hairline cracks reducing compression or something,just guessing.

[Nameless Drudge]

Pitting/corrosion around the exhaust valve,compression but not enough for Diesel?

[chris scott]

Found these ...just make sure they are not Chinese ! The Italians in general make good engines.
  http://stores.ebay.co.uk/deltastore-technology/MOTORI-DIESEL-/_i.html?rt=nc&_fsub=1633426017&_sid=261385687&_trksid=p4634.c0.m14.l1581&_pgn=1

[Matt Gibson]

My mate just bought one of those acme motore washers second hand. Looks just like a yanmar but apparently Lombardini just bought over a few of the smaller italian engine manufacturers so most of them are pretty reliable and parts can be gotten easily from lombardini.