Author Topic: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)  (Read 33785 times)

Offline Dlsnow

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Im registered on mcibustalk now!

Thanks John and Dave says hi.

Thanks for the support all.
1972 MCI7 8v71 converted - 1kw solar on roof

Offline Frank @ TX

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Re: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)
« Reply #16 on: September 07, 2012, 03:48:44 PM »
I thought I knew some stuff about DD 2 strokes.
How can a broken tip from and injector leak all that fuel to the outside?
I would have thought the fuel would leak back down to the crank case or flood the cylinder.
What am I missing.
Thanks
Frank

Online luvrbus

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Re: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)
« Reply #17 on: September 07, 2012, 05:23:16 PM »
Yes it can Frank kinda like a flooding carburator on a gas engine I never saw one that bad that didn't lock the engine down though.

I still wonder where the tip is that scares me when they bury on a piston and later down the road the edge of the piston turns loose like happen to Mark
Life is short drink the good wine first

Offline eagle19952

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Re: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)
« Reply #18 on: September 08, 2012, 09:09:05 AM »
sounds like a good time to pull the air box covers...surely DD gave you some of those   :o
Donald PH
1978 Model 05 Eagle w/Torsilastic Suspension,8V71 N, DD, Allison on 24.5's 12kw Kubota.

Offline Slow Rider

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Re: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)
« Reply #19 on: September 17, 2012, 09:23:16 AM »
Any progress Dave?  Don't leave us hanging?

Frank
The MCI has landed..... We are home.
Dale City Va.  Just a southern suburb of DC
Yes I am a BUSNUT
1976 MCI MC8

Offline Dlsnow

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Re: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)
« Reply #20 on: September 17, 2012, 10:21:56 AM »
Sorry all,
I didnt mean to abandon this post.  My notifications havent been working, noticed the email on my profile isnt right.  Asking for it to be fixed now.

Update
visual inspection on that cylinder showed no trace through the airbox cover.  Mechanic suggested it must have passed through exhaust.  Is that possible, would it fit.  He admitted in all his years running mci's he has never seen this issue.
1972 MCI7 8v71 converted - 1kw solar on roof

Offline Dlsnow

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Re: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)
« Reply #21 on: September 17, 2012, 10:23:08 AM »
On the otherhand
i am currently stranded with what seems to be a lack of fuel (prime lost) kind of issue.
About to prime it.
1972 MCI7 8v71 converted - 1kw solar on roof

Offline Dlsnow

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Re: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)
« Reply #22 on: September 27, 2012, 10:04:32 AM »
Well - not out of the woods yet - ran with little smoke the last couple weeks - but got white smoke again
i think the injector issue was a symptom of something else
while running i noticed the same leak as last time (raw fuel coming out of exhaust manifold connection to exhaust pipe)
so I popped off the airbox cover on the cylinder that got the new injector and found what is pictured below
12 similar shape and size metal diamond shaped pieces
they look broken from a rod

I looked through the dd v71 manual - engine section and couldnt find anything remotely close to this shape
what are they - where did they come from?
im confused and praying this is a repairable situation
1972 MCI7 8v71 converted - 1kw solar on roof

Online luvrbus

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Re: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)
« Reply #23 on: September 27, 2012, 10:51:26 AM »
Parts from the injector,buy a cheap bore scope from HF and look inside at the top of the head it is repairable exchange head and a piston and liner kit I feel for you but I tried to tell you 
Life is short drink the good wine first

Offline John316

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Re: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)
« Reply #24 on: September 27, 2012, 11:09:10 AM »
DLS, Sorry to hear the bad news. That is not hoped for. Hopefully your mechanic is still close.

Clifford, as I try to tell new comers, you can seriously go to the bank on what you predict. I am amazed every time.
Sold - MCI 1995 DL3. DD S60 with a Allison B500.

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Re: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)
« Reply #25 on: September 27, 2012, 02:12:47 PM »
If those pieces were laying inside the air box out side the cylinder ports and not inside the cylinder your blower probably came apart
Life is short drink the good wine first

Offline Dlsnow

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Re: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)
« Reply #26 on: September 27, 2012, 03:48:10 PM »
Those parts came out inside of the air box cover. they were stuck in it with all oily goop.  I look inside of the cylinder with a bore scope and didn't find any significant marks or scratches or scuffs.  I am pulling out the injector right now to use the borescope going to look at the top of the piston.  Looking at the exploded view of the C 60and injector I don't see where these particular parts could have come from.

Blower parts...ill check that ... suggestions on isolating blower parts?
1972 MCI7 8v71 converted - 1kw solar on roof

Offline gus

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Re: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)
« Reply #27 on: September 27, 2012, 04:18:57 PM »
They sure look like gear teeth to me.
PD4107-152
PD4104-1274
Ash Flat, AR

Offline Geoff

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Re: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)
« Reply #28 on: September 27, 2012, 04:21:41 PM »
Okay, I been having to wait 2 minutes to load every page off this website.  Ready to give up.

Looking at the picture of the penny with the broken pieces I say they are liner ports.

Time to pull the head and put a new kit in that hole, if everything else is okay.

--Geoff
Geoff
'82 RTS AZ

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Re: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)
« Reply #29 on: September 27, 2012, 04:24:28 PM »
While you have the injector out run a compression test if you don't have 350 to 400 lbs running at 900 rpm on the test it's time to slip into your coveralls

good luck
Life is short drink the good wine first