HELP - 8V92 will not start

[Curt Sprenger]

Problem could be the fuel pump drive coupling fork. The coupling fork could be broken or worn. I'm looking at my 92 series manual and I'm assuming the fuel pump on your engine is the same as mine.

On Fri, Jun 20, 2008 at 4:52 PM, Larry Kehler <"llkehler@gmail.com"> wrote:

I am making some progress but I thought I would update everyone on

what is happening.

Using Curt's article on replacing his fuel hoses, I built a electric

prime pump and put a ball valve to open and shut the feed line.

I ran about a gallon of fuel through the system and then tried to

start the engine with the electric pump still running. It cranked and

pumped out white smoke. After several more pump tries and more white

smoke. I determined that lost prime was not the problem. It was

clear that the injectors were not firing. I started worrying that I

had toasted the ECM. I decided that I had to find a 92 series

mechanic with some diagnostics tools. I drove to several truck repair

garages and got the same response-

"yea we work on Detroits" - "What do you mean 2 stroke, I never seen

no 2 stroke diesel".

Then I found on the way home, the Detroit Diesel Dealer has moved to

within 10 miles of my house.

I found a old 92 series mechanic who was at the new facility teaching

young mechanics. He took me to a 89 Newell coach and told me that if

my stop engine and check engine light come with the ignition switch

and then both go off after 10 seconds, my DEC ECM is OK.



I showed him what I had done with my prime pump. His response was

that the injectors were not firing because I need 80 Pounds of fuel

pressure to fire. He said it could be leaking hoses or fuel pump.

He suggested a pressure gage to check the fuel pressure. He also

showed me to which outlet hose to pull off and put in a bucket of

clean fuel and crank the engine If I get bubbles in the fuel, then I

likely have a bad hose. If the flow is clean and clear, then I might

have a bad pump. The pressure gage will tell the story on the pump.



Two bad possible causes is a broken drive shaft for the pump. The

other is the sensors that time the ECM. The last two options would

require towing the coach to their facility.

If it is a new pump, he said I should be able to replace the pump and

told me the steps to pull the Coldplate/DECC.



So I am encouraged that I will be able to get going in the next two or

three days. I will keep you posted.



Larry Kehler

1994 PT-40 WBDA

St Louis



--- In "WanderlodgeForum%40yahoogroups.com", "ronmarabito2002"

wrote:

>

> If you got those injectors dry, it might take a while to get fuel

> through and the engine fire. Also, I assume the engine is cranking at

> a pretty good speed. Weak batteries won't spin the engine fast enough

> to get a compression ignition.

>

> I spent 35 minutes once repeatedly cranking before I got it to run.

>

> R.E. (Ron) Marabito, Dallas, TX 92WB40

>

--
Curt Sprenger
1987 PT38 8V92 "MacAttack Racing"
Anaheim Hills, CA