MERCURY MERCRUISER MARINE 8.1L 496 Injector missing Pintel cap

[tricountytrail]

So pulled out my fuel rail for clean my injectors and found 1 injector missing pintel cap.
Looks like it has been missing for a while. Wondering if anyone has seen this?
I will scope cylinder and check but its probably long gone. The oring was in hole and it definitely was missing when it came out. any thoughts?

 

[alldodge]

Haven't seen this happen, maybe it was not reinstalled prior

 

[Grub54891]

Strange one. It’s not in the hole? I’d imagine not.

 

[tricountytrail]

I will check with my borescope before i reassemble. If it's in there I will see it. But I bet it wasn't on when I pulled it just the o-ring

 

[dubs283]

I like the buildup of material on the injector in question.

Makes me wonder the condition of the rest of the engine

 

[rustybronco]

I've seen it happen in the automotive field. They split and eventually fall off.

 

[tricountytrail]

I've seen it happen in the automotive field. They split and eventually fall off.

Thanks I will check with my endoscope. Anyone know when replacing injectors does the fuel rail needs
to be bled???

 

[alldodge]

Yes, bleed it at Schrader valve

 

[Bt Doctur]

Next time remove the wire harness first , then the rail, then the injectors

 

[tricountytrail]

Next time remove the wire harness first , then the rail, then the injectors

I did was pretty careful it just wasn't there. If if wasn't already split there is NO way it just fell off, the o-ring was in the manifold.

 

[rustybronco]

Is the hole in the port large enough for the cap to pass into the intake manifold? I would suspect it would be.

 

[tricountytrail]

Is the hole in the port large enough for the cap to pass into the intake manifold? I would suspect it would be.

Yes

 

[tricountytrail]

Found the Pintel cap on top of intake on cylinder #4 got it out wonder how long its been off?

 

[tricountytrail]

Got injectors back flow tested fine, reinstalled on rail now to get the back in boat for test. Also ohmed out injectors to harness.

 

[alldodge]

The cap fell off when the rail was being removed

 

[tricountytrail]

The cap fell off when the rail was being removed

It was not on there when removed just oring

 

[alldodge]

Agree, my thought is as you were wiggling the rail to remove it fell off before the rail came loose from the intake