Bus Conversions dot Com Bulletin Board
July 24, 2014, 01:12:25 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: If you had an E-Mag Subscription: It arrives at least two weeks before the First Class printed magazine.
   Home   Help Forum Rules Search Calendar Login Register BCM Home Page Contact BCM  
Pages: 1 [2] 3 4 5 6 7   Go Down
  Print  
Author Topic: MCI7 8v71 stranded grey smoke increasing with accelleration (injector issue?)  (Read 11510 times)
Dlsnow
dave
Full Member
***
Offline Offline

Posts: 170


dave




Ignore
« Reply #15 on: September 06, 2012, 05:44:46 PM »

Im registered on mcibustalk now!

Thanks John and Dave says hi.

Thanks for the support all.
Logged

1972 MCI7 8v71 converted - 1kw solar on roof
Frank @ TX
Full Member
***
Offline Offline

Posts: 221




Ignore
« 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
Logged
luvrbus
Hero Member
*****
Offline Offline

Posts: 12064




Ignore
« 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
Logged

Live each day like it was your last,one day it will be
eagle19952
Hero Member
*****
Online Online

Posts: 826




Ignore
« 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   Shocked
Logged
Slow Rider
Global Moderator
Hero Member
*****
Offline Offline

Posts: 669




« Reply #19 on: September 17, 2012, 09:23:16 AM »

Any progress Dave?  Don't leave us hanging?

Frank
Logged

The MCI has landed..... We are home.
Dale City Va.  Just a southern suburb of DC
Yes I am a BUSNUT
1976 MCI MC8
Dlsnow
dave
Full Member
***
Offline Offline

Posts: 170


dave




Ignore
« 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.
Logged

1972 MCI7 8v71 converted - 1kw solar on roof
Dlsnow
dave
Full Member
***
Offline Offline

Posts: 170


dave




Ignore
« 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.
Logged

1972 MCI7 8v71 converted - 1kw solar on roof
Dlsnow
dave
Full Member
***
Offline Offline

Posts: 170


dave




Ignore
« 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
Logged

1972 MCI7 8v71 converted - 1kw solar on roof
luvrbus
Hero Member
*****
Offline Offline

Posts: 12064




Ignore
« 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 
Logged

Live each day like it was your last,one day it will be
John316
Hero Member
*****
Offline Offline

Posts: 3212

MCI 1995 DL3, DD S60, Allison B500.




Ignore
« 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.
Logged

MCI 1995 DL3. DD S60 with a Allison B500.
luvrbus
Hero Member
*****
Offline Offline

Posts: 12064




Ignore
« 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
Logged

Live each day like it was your last,one day it will be
Dlsnow
dave
Full Member
***
Offline Offline

Posts: 170


dave




Ignore
« 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?
Logged

1972 MCI7 8v71 converted - 1kw solar on roof
gus
Hero Member
*****
Offline Offline

Posts: 3486





Ignore
« Reply #27 on: September 27, 2012, 04:18:57 PM »

They sure look like gear teeth to me.
Logged

PD4107-152
PD4104-1274
Ash Flat, AR
Geoff
Hero Member
*****
Offline Offline

Posts: 518





Ignore
« 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
Logged

Geoff
'82 RTS AZ
luvrbus
Hero Member
*****
Offline Offline

Posts: 12064




Ignore
« 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
Logged

Live each day like it was your last,one day it will be
Pages: 1 [2] 3 4 5 6 7   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!