Yanmar 4JH2 DTE injection pump timing ??

[cruizn]

Hi,
I recently had the injection pump serviced.
I rei stalled it but engine still not starting.
I originally thought engine won't restart as there was a problem with the injector pump ..so 5K later I have reinstalled it & still engine not starting. I kicks over but does not start. I thought it could be the stop lever is engaged. But I have cheked both in & out positions.. nothing.
I have tired to bleed the system as well.

Does the Yanmar 4jh2 injection pump require special timing when reinstalling it. I thought because it has a key on the injection pump shaft as long as I align it and it slides back in all is good..no ?

Note: The engine was running.. then I pulled the cold start lever. It stopped & never restarted since.

Hope for some help before I jump of the back of the transom into the depths as this is driving me mad.

[cruizn]

A friend says I might have installed the injection pump 180 degrees off.

[skipperpete]

To get the timing out by 180° you would either have to turn the engine over with the injector pump off.... OR .... there are 2 key ways on the input shaft and you picked the wrong one. If you didn’t turn the engine over pre the pump install and you didn’t somehow move the timing gear from your original marks and the key was still in the original slot she can’t be out by 180°

[skipperpete]

PM me , I’m going to Sydney soon to fix an engine... I might have time to swing by and time it for you.

[cruizn]

I have tried to start the engine many times now... but no luck.

It turns over.. I have bleed the first stage ( fue filter) & the injection pump.
I also bleed all injector lines. Still not starting.. it wants to start though

SO, I feel the timing is incorrect. I'm not sure where the timing markings are for Yanmar 4JH2E. I hope they are not only on the flywheel as I have terrible access to view the flywheel from the side. I hope there are notches on the cogs where the injection pump is bolted to the housing at the front of the engine.

Hope someone can point me to a video or manual.

I plan to try again next weekend.

[cruizn]

Here are the injection timing markings for YANMAR 4JH2E

https://www.manualslib.com/manual/11...page=63#manual

They are located on the side of the flywheel.. only way to view them is through a small hole on the side of the flywheel housing...
This is near impossible to view. I have a wall there

[SY Harmony]

Originally Posted by cruizn

Here are the injection timing markings for YANMAR 4JH2E

https://www.manualslib.com/manual/11...page=63#manual

They are located on the side of the flywheel.. only way to view them is through a small hole on the side of the flywheel housing...
This is near impossible to view. I have a wall there

Can you get a mirror or your phone camera in there to aid in visualizing the marks?

[ScottRhodes13]

I have a 4jh2-hte. Although the manual says the timing marks are on the flywheel, I have never been able to find them, even though I have good visibility. I think that information in the manual may be obsolete -- possibly a carry over from the 4jh line. There are some timing marks on the injector pump though. I know that it can be rotated to adjust the timing. It's possible these marks can give an indication as to the correct timing, but fortunately, I haven't had to test that theory yet. Sorry I can't be more specific.

[cruizn]

Yes I agree.. I could not find any viewing hole on the side of the flywheel housing.

This is becoming very confusing as I need to align the flywheel first.. yes ?

[cruizn]

I believe this is the location for the timing marks, located bottom of the flywheel housing is a small 1" hole - this location makes it near impossible for viewing with engine in the boat.

[ScottRhodes13]

Yeah, that's the hole I've been looking into, but can't see any marks. My flywheel is a little rusty though, and the crankshaft has to be positioned just right, so if the marks are inconspicuous, I could be missing them.

[ScottRhodes13]

Just a wild guess, but have you tried looking into that oil filler hole that's near the injector pump to see if there are any markings near the gears? Sorry, I'm not near my boat or I'd run down and take a look myself.

[ScottRhodes13]

One warning once you figure out how to adjust the timing. I see the service manual lists 17 deg btdc for all engines. The operator's manual lists 10 deg btdc for the 4jh2-dte. I think 17 was for the 4jh series.

[Recy]

Have you tried with something like this to be able to see the markings?

https://www.amazon.com/Endoscope-Adj...4657098&sr=8-3

There is a FB Yanmar group you could try to ask.

https://www.facebook.com/groups/465795967682309

[cruizn]

Good idea to use an endoscope.. I totally forgot that I actually have one stowed away somewheres...but the resolution is fairly low. I'll give it a crack though.

Regarding the flywheel condition.... yup mine is also suffering from surface rust probably making it harder to see the marks.