Re: [ihc] Diesel Injector Question

[bearbvd@xxxxxxxxxxxxxx (Greg Hermann)]

At 8:01 PM 5/16/04, Joseph Shaw, II wrote:

I can't tell from what you wrote whether you got any air into the HP
injector lines from the pump to the injectors in the head. If there is any,
that is your problem. These lines need to be bled--with air in them, the
pump simply compresses the air in there, and no fuel comes out of the
injectors.

Essentially, you need to crack the fittings at the injectors in the head
slightly loose, and crank the engine with them loose, then tighten them. If
you have compression, it should then start.

Have you tried to see whether the engine will fire if you feed it a bit of
ether ??

Greg

>Okay-also, sicne I cannot seem to get on my beloved diesel forum, let me ask
>this question here:
>
>I am working on a '67 Scout body mounted on a '77 Scout II diesel frame and
>running gear.  It has an auto trans, and is non-turbo, SD33.
>
>I have been slowly trying to bring her back to life, as she had sat for about
>six or eight months when I got her, and has sat about six since I got her, so
>I have been trying to take it slow.  With the exception of a dead battery, she
>was thought to have been a runner (engine-wise) when I got her.
>
>I have gotten a new battery, had the starter rebuilt, and cleaned out the fuel
>filter and filled it with FRESH diesel fuel.  I have got it to where the
>starter turns it easily and quickly enough to start, I would think.  However,
>I still have no start.
>
>I have checked the glow plug circuit, and the circuit itself seems
>intact-meaning that all seem to have ground and there seems to be juice
>getting to the wire on each glow plug.  I have not checked to see if there is
>any inherent flaw in each individual glow plug.  I checked my glow plug
>switch, and though it does not seem to have a working "relay" system (or
>whatever the timer is that holds the juice on after the button is pushed for
>15-20 seconds or whatever), when the button is held on it seems juice is
>getting through.  I was really not too worried about the glow plug system, as
>my prior knowledge of diesels (from a couple of older Mercedes Diesels from
>the '70's) was that they would usually start even without the glow plugs
>working unless it was particularly cold.
>
>Anyway, I feared that the fuel pump/injector pump was not working, so tried to
>check it.  I had checked the line that runs down the side of the injectors to
>see if they were getting fuel when I pumped the hand/primer pump.  They were.
>I checked when the engine was turning itself over, and they did not spit out
>any fuel, so I feared maybe the injector pump was not working.  However, after
>finding out that this line is the "overflow return" line, I realized that,
>theoretically, these lines should NOT be getting any fuel unless the pump was
>pumping TOO much fuel, which I guess I will figure out later.
>
>So, I cracked the injectors at the top where the line feeds directly into
>them, and cranked the engine.  All six injectors were sending out spurts of
>fuel, and all seemed pretty equal in their little squirts.  Should these
>squirts maybe be LARGER and it is not getting enough fuel?
>
>The fact that I know the pump is sending fuel into the injectors, and it is
>NOT coming out the overflow lines, I am guessing this is good reason for me to
>believe that the injectors are not clogged somewhere, and this fuel is
>actually reaching the cylinders.
>
>SO-now what????  Should I further troubleshoot the glow plugs?  Pull them,
>wire them to ground, and then run a hot lead to them to see if they are
>glowing/heating up?  And if not, should the Scout start even without them?
>
>Any other suggestions on what to try next?  I thought I had been quite careful
>and methodical in the way I have gone through this, but am beginning to get a
>bit discouraged.  I either need to get this thing running so I can drive it,
>or I need to sell it to someone that knows more soon!  I had sold it once when
>desparate for money, but the buyer then decided against it.  I agreed to send
>back his money as soon as possible, but am trying to get this running so I can
>keep it for my driver, and then can sell my other trucks.  However, if
>something does not "eureka!" here soon, I am going to have to let this one go
>anyway, and that is NOT what I want to do!!!
>
>Thanks for any help/knowledge/suggestions!
>
>Michael