3-53 Detroit rack timing

Ah ya thats a problem. Unknown hands in the cookie jar. Which is why I first suggested a whole tune up. so you can start on a known square one. and directly plumbing the transfer pumps to a clean pail of diesel. are you even sure its good diesel in the tanks? you know what I mean. what was the fuel pressure?

Trouble shooting the shot gun method usually never works out. start at the beginning.
 
1-5-3-6-2-4 said:
Ah ya thats a problem. Unknown hands in the cookie jar. Which is why I first suggested a whole tune up. so you can start on a known square one. and directly plumbing the transfer pumps to a clean pail of diesel. are you even sure its good diesel in the tanks? you know what I mean. what was the fuel pressure?

Trouble shooting the shot gun method usually never works out. start at the beginning.
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Clean fuel from our bucket was the first thing we did..lol... Just ordered an injector timing tool... My biggest thing according to the service manual i found was the rack position at full fuel.. If im looking at it right every injector it way out of time.. unless im confused at which end is full rack?? (looking at injector with the fuel ports pointed tward me is full rack closest to me (Out( or all the way in??)
 
Fuel Pressure was at about 8 when cranking and 40 when i had it running on the ether. The fuel line was unhooked from the tank when they brought it to us so we just put the line into a container of good diesel fuel with an inline pusher pump.
 
i guess we are confused on how the Gov and Rack works on this thing. I was under the assumption that with the rack all the way in is the shut off posistion because when the shut off on the Gov. housing is pulled the rack goes all the way in, and when you pull on the throttle, the rack travels out.
 
kino_fab said:
i guess we are confused on how the Gov and Rack works on this thing. I was under the assumption that with the rack all the way in is the shut off posistion because when the shut off on the Gov. housing is pulled the rack goes all the way in, and when you pull on the throttle, the rack travels out.
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IIRC, Detroits start in full fuel.
 
Most all mechanically injected diesel injection pumps are in the full-fuel position when starting. That's why most of them belch the smoke upon start-up.
 
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i realize that, what i am saying it when the shut off lever is pulled to the off position, it moves the rack completely in and the throttle lever will move the rack out when pulled. Just seems completely backwards from what its supposed to be.
 
That's certainly bass ackwards. The rack should move into the injector to increase fuel. IIRC, isn't the throttle shaft splined? If so, can the throttle lever simply be swapped around or would the fix be linkages inside the governor housing?
 
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i believe you can rotate the levers. I could understand the throttle being backwards acting a a deccelarator like on a dozer, but still confused on the shut down lever.
 
little update.. changed injectors.. no change.... pulled the tophat off the blower oil came pouring out... pulled the blower off and the air side was full of oil... Got another blower, cleaned up the oil, remade the gaskets and tried again... same thing. Turned it over a few times got it running on starting fluid. would not take fuel and still backfired through the blower.
Still stumped... any ideas??

Thanks
 
Has that engine ever ran in the machine?

Might pull the injectors and make sure the fuel is getting through the head to them. Only other thing I can think of is sheared keyway. I assume you have checked the compression and the fuel pressure?
 
roachie said:
Has that engine ever ran in the machine?

Might pull the injectors and make sure the fuel is getting through the head to them. Only other thing I can think of is sheared keyway. I assume you have checked the compression and the fuel pressure?
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Engine was rebuilt and was running at some point in time. The guy that owned the skidder passed away and his sons used it.. well it quit and they couldnt get it back running.. no clue what they did except they did put a lift pump on it ( It is the correct pump for the engine)

Spoke with a gentelmen today that has alot of experence with them and says the reason for the intake filling up with oil could either be bad seals in the blower (Tried 2 different blowers, same issue) or a wrist pin retainer could have came loose and letting oil pressure get out on the intake side.
So looks like a teardown is in order to find out for sure.
 
ahh... detroits... one of the most veritile engines ever made... to swap engine rotation everything had to be swap L/R

worked on serval 53s 71s, 645, 1049s

engine will not run if there is no positive air pressue in the air box.
iirc air box pressue should be about 8psi
w/o the roots blower is a considered a 2 cycle... with the roots is considered a 4 cycle..
setting "bounce" was alway fun on V16s :shake:
 
jimbo486 said:
:what:
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the detroits do not "develope" their own intake vaccum" since the scavanging ports are their intake ports are at the bottom of the cylinder... thus will not run with out the air box being pressurized..

with just the roots blower its also considered by detroit to be naturally aspirated... and forced inducted when you throw a turbo on top of it..
 
Do they not inject fuel or "fire" each time the piston approaches TDC? Thus, being a 2-stroke? The scavenging due to the pressurized airbox is actually what helps push the exhaust gases out as well. And aren't all Detroits equipped with the roots-type blowers?

Am I completely off-track? That's what little about Detroits that I can recall from my diesel tech. classes. Go easy on me as I'm 11 hours into a 12hr. nightshift right now. :redx:
 
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