Loose injector

[scozzy]

Hi all, quite possibly a stupid question so looking to confirm what I think...is the answer ...

Trying to get yanmar 1gm10 started with no joy with usual remedies (bleed,easy start hot air in intake etc)
So decide on compression test and go to take out injector....
2 things...came out v easy and clamp itself was in fact loose on applying wrench
So...thinking loose clamp will cause leak and therefore rubbish compression? Yes?
Second it seems that the injector should be quite hard to remove and it definitely wasn't...am guessing cranking over " popped" injector and made easy to remove whilst unaware it was in fact loose!?

Long story short will check spray pattern etc while it's out but could..After all my faff..a loose clamp on injector be the initial problem with starting?

 

[mrangry]

I dont think so as a loose injector would allow blow by of combustion gases causing a black goo and carbon build up around the injector. This in turn would make it difficult to remove. What did compression test reveal?

 

[scozzy]

havent done it yet,dropped by local machanic to borrow tester and he was gone!

 

[Lucy52]

Late to the party, but I had an injector problem on my diesel Smart. It was leaking fuel. As the fuel was clear, the mechanic said that it was from the high-pressure supply. Had it been from injector blow back, then it would be "chuffing" and the fuel would appear foamy. It was a cracked injector, a new injector solved it.

Always put a new copper washer on every time you refit an injector.

 

[Rappey]

Second it seems that the injector should be quite hard to remove

I removed one on a 1gm that had been in for a long time and it was easy. They are fairly short compared to others.
You would certainly lose compression with a loose injector, but you would also hear it when cranking.

 

[scottie]

Late to the party, but I had an injector problem on my diesel Smart. It was leaking fuel. As the fuel was clear, the mechanic said that it was from the high-pressure supply. Had it been from injector blow back, then it would be "chuffing" and the fuel would appear foamy. It was a cracked injector, a new injector solved it.

Always put a new copper washer on every time you refit an injector.

Make sure that all the other washers are removed before adding new one

 

[scottie]

Late to the party, but I had an injector problem on my diesel Smart. It was leaking fuel. As the fuel was clear, the mechanic said that it was from the high-pressure supply. Had it been from injector blow back, then it would be "chuffing" and the fuel would appear foamy. It was a cracked injector, a new injector solved it.

Always put a new copper washer on every time you refit an injector.

Further to my earlier reply don’t fit washers to injectors in copper sleeves ie Volvo style

 

[Bilgediver]

Hi all, quite possibly a stupid question so looking to confirm what I think...is the answer ...

Trying to get yanmar 1gm10 started with no joy with usual remedies (bleed,easy start hot air in intake etc)
So decide on compression test and go to take out injector....
2 things...came out v easy and clamp itself was in fact loose on applying wrench
So...thinking loose clamp will cause leak and therefore rubbish compression? Yes?
Second it seems that the injector should be quite hard to remove and it definitely wasn't...am guessing cranking over " popped" injector and made easy to remove whilst unaware it was in fact loose!?

Long story short will check spray pattern etc while it's out but could..After all my faff..a loose clamp on injector be the initial problem with starting?

Injectors should be free to lift out as the seal is achieved using copper washers or in the case of some Volvo's the base of the copper sleeve.

If the injector was loose in its pocket with a loose clamp and there was no sound of escaping air then yes maybe an internal problem.

Remove the injector. Squirt a few squirts of engine oil into the cylinder and then wind over decompressed before winding over with decompress off. I would expect to feel compression then. If not then engine will never start and it is a head off inspection.