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Old 06-16-2014, 08:08 PM   #1
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Perkins 4-236 died - Pump?

While underway to Cleveland, the starboard engine quit. We were in 3 - 5 seas, (thanks, weather service) so I suspected a fuel problem as in a clogged filter. Limped into Lorain and spent three hours trying to get the engine started again. Went through the bleeding process repeatedly, looking for leaks. Nothing. Returned to Sandusky on the port engine. The final step in bleeding is to open the throttle full, crack two injector lines, and try to start it. When fuel gushes from the loose lines, tighten up, and she'll start on the next spin. Usually. Did get the engine to start, but when bringing the throttle back from wide open, it died. Then would not restart. I get good clear flow from the filters and bleeder ports, but nothing from the injectors. Has anyone ever had an injector pump go bad? Only 2400 hours on the engine, but 40 years old. Several of my dock neighbors have had a crack at it, and can't get it to run either.
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Old 06-16-2014, 08:40 PM   #2
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If you have the CAV injection pump there is a screen (filter ) in the pump.Where the inlet line bolts onto pump.Just a thought.Have seen then foulded before.
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Old 06-16-2014, 09:34 PM   #3
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Sorry to hear about the engine fuel problem Bilgewater. Hopefully you can getter going tomorrow.
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Old 06-16-2014, 10:30 PM   #4
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I'm sure you've probably already done this.

But check the linkage between the "Kill Switch" solenoid and the fuel lever on the injector pump. If the lever on the pump is not all the way open (down). . . no fuel will be delivered to the injectors. Use your finger to hold the lever down and try to start it. If it pops back up. . . there is an issue there. I've seen them hang up before.
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Old 06-16-2014, 11:08 PM   #5
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Some CAV pumps have an electric stop solenoid located down under body of pump. Not sure if the 236 has that. Worth a check.
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Old 06-17-2014, 12:12 AM   #6
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My Perkins 4-154's have these electric stop solenoid however I'm not sure where it is located.
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Old 06-17-2014, 12:24 AM   #7
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1. Did you bleed the fuel pump port? (See Page 12 of attached handbook)

2. Are you SURE those filters are clean? Do you have Racor primaries? Checked or replaced the secondary?

3. Rough seas and engine failure sounds like a fouled filter more than a failed fuel pump. I have to crack all 4 lines to bleed adequately. I start at the fwd line, then move aft.

4. Is your lift pump allowing your engine mounted filter to bleed?
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File Type: pdf Perkins 4.236 Handbook.pdf (1.31 MB, 61 views)
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Old 06-17-2014, 02:40 AM   #8
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Is there a transmission neutral switch?
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Old 06-17-2014, 08:51 AM   #9
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Is there a transmission neutral switch?
He can crank the engine over so it's not a neutral safety switch issue.
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Old 06-17-2014, 11:30 AM   #10
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Depends if the neutral switch is connected to the fuel shutoff or the cranking system.
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Old 06-17-2014, 11:33 AM   #11
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Depends if the neutral switch is connected to the fuel shutoff or the cranking system.
My 36 MarkII has the neutral safety switches wired to the cranking circuit not the fuel shut down solenoid. I have the 4-154M's they are fairly close to the Perkins 4-236M's.
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Old 06-17-2014, 12:13 PM   #12
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A little OT, but just called TransAtlantic Diesel and asked if they sell rebuild kits for the 4-236 lift pump; they don't. It's a bit of a PIA to get that pump off the engine and a new one back on. If you could buy the diaphragm, gasket, etc. it would be much easier to remove the diaphragm cover and replace it. Anybody know where these parts might be sold.?
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Old 06-17-2014, 01:46 PM   #13
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The Perkins Parts and Engines Superstore

These folk have all kinds of parts, including lift pumps. Hope this helps
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Old 06-17-2014, 02:02 PM   #14
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Many thanks for the suggestions.

A diesel mechanic came by and confirmed my thoughts that the injector pump itself is shot. (The pump's dead,Jim) (But Bones, there must be something you can do!) (The pump's dead, Jim)
Waiting now to find out about availability of overhauled units verses repair. Also going to replace both lift pumps at this time.

The one good thing is that we're not losing any time, as the weather is crap. Windy with thunderstorms for the rest of the week. We're not going to do 3-5 waves unless absolutely necessary.
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Old 06-17-2014, 04:25 PM   #15
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Glad to see you figured it out. How hard is the R&R?

I think the new ULSD could be a factor since it wore out so fast.
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Old 06-17-2014, 04:32 PM   #16
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FWIW, I was on a 41 (I think) Gulfstar in Puerta Vallarta, MX for a week. A nice boat.
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Old 06-17-2014, 04:58 PM   #17
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Quote:
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Many thanks for the suggestions.

A diesel mechanic came by and confirmed my thoughts that the injector pump itself is shot. (The pump's dead,Jim) (But Bones, there must be something you can do!) (The pump's dead, Jim)
Waiting now to find out about availability of overhauled units verses repair. Also going to replace both lift pumps at this time.

The one good thing is that we're not losing any time, as the weather is crap. Windy with thunderstorms for the rest of the week. We're not going to do 3-5 waves unless absolutely necessary.
What caused the pump to fail Bilgewater? Was it age catching up or something else? This concerns me because soon I'll be making the trip to NJ with my 4-154M's and the last place I need engine trouble is in the Delaware Bay.
Thanks for any input you can provide.
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Old 06-17-2014, 05:08 PM   #18
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Is that pump self lubricating or does it rely on the diesel? Now that the sulphur is gone, you might need to add a lubricant to your diesel at fill ups.


Just sayin.
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Old 06-17-2014, 05:24 PM   #19
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Quote:
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The Perkins Parts and Engines Superstore

These folk have all kinds of parts, including lift pumps. Hope this helps

Thanks for the tip on Perkins supplier I have book marked this site for parts etc again great post
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Old 06-17-2014, 06:09 PM   #20
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Don't know any details yet. Still waiting to hear back about an exchange.
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