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09-04-2019, 08:53 AM
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#1
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Member
City: Sun City Center
Join Date: Jul 2019
Posts: 10
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Lehman 80 hp fuel in bilge blue smoke
Half way on my repositioning cruise from Galveston to to Tampa the starboard engine started to billow blue smoke. It never smoked before. The engine oil was checked and was several inches high. The oil was changed regularly on route after several hours and we made it to Tampa. The engine continued to run good the entire way. So I’m confused.
Now the question. I need to solve the issue. I have read it could be injectors, fuel lines, fuel lift pump. Stuck extra fuel button. Given the quick onset looking for help pinpointing the logical place to start and not just throwing money at wrong solutions.
Thanks to all in advance
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09-04-2019, 09:09 AM
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#2
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Guru
City: Cape May, NJ
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,966
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Engine make, model, year, hours, etc
Ok Lehman 80
__________________
Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May, NJ
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09-04-2019, 09:11 AM
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#3
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
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Pull rocker cover and look at fuel lines under the cover. Seen return rail fracture on these and it puts fuel in the oil.
Do not run the engine with that diluted oil in the sump, good way to wipe bearings. Drain oil and put in good oil before troubleshooting runs.
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09-04-2019, 09:11 AM
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#4
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Member
City: Sun City Center
Join Date: Jul 2019
Posts: 10
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It’s a 1982 Lehman 80 about 3000 hrs
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09-04-2019, 09:17 AM
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#5
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Guru
City: Pender Harbour, BC
Vessel Name: Gwaii Haanas
Vessel Model: Custom Aluminum 52
Join Date: Sep 2013
Posts: 3,791
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All of that plus are you changing the Sims oil at 50 hours?
__________________
Don't believe everything that you think.
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09-04-2019, 09:20 AM
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#6
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Member
City: Sun City Center
Join Date: Jul 2019
Posts: 10
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I had everything serviced before I left engines including the sims oil and transmissions
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09-04-2019, 10:49 AM
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#7
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Guru
City: Brookline, NH
Vessel Name: Shalloway
Vessel Model: Defever 44, twin Perkins
Join Date: Sep 2013
Posts: 2,260
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Quote:
Originally Posted by Hendrik1
I had everything serviced before I left engines including the sims oil and transmissions
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Could it be that the oil was mistakenly overfilled?
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09-04-2019, 10:53 AM
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#8
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Guru
City: Boston
Vessel Name: Adelante
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 1,611
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Quote:
Originally Posted by Ski in NC
Pull rocker cover and look at fuel lines under the cover. Seen return rail fracture on these and it puts fuel in the oil
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Agree. You can run w.o. rocker cover. Some oil might spill over on aft end. Nothing a paper towel can't handle. I would re-tighten all fittings. Note they are brass so don't torque them. Cracked line may not be obvious so use an LED flashlight and small mirror to check every inch.
Fuel pump is next candidate.They are inexpensive but a pain to replace. I would just replace it as a maintenance item.
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09-04-2019, 12:52 PM
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#9
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Guru
City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 3,023
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Most likely cause of fuel in the pan in larger quantities is failure of the injector pump seal.
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