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I have a question on an Yanmar 440 6LY-STR, Anyone out
Twin 2007 Yanmar 440 6LY2-STR on a Silverton 43 Sportbridge. Boat has approx 500 hours. Oil changes every 100 hours, zincs, etc. One of the engines (not sure which yet) has begun screeching, very hi-pitched, when brought up off of idle. Sound only goes away when temp comes up. The boat has underwater exhaust. I have never had the valves adjusted or any other maintenance other than oil, filters, etc. Questions are: 1) What might be causing this screeching? Turbo bearings? Valves? I know that some of the 6LY2s had bad valve systems. When I purchased the boat, I did confirm that we got 3300 rpms at full throttle, but that was gauged by Faria Analog Tachs.… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,328 satisfied customers
Just reading your post regarding the Yanmar 6LPA motor related
Just reading your post regarding the Yanmar 6LPA motor related to valve stem issues. I have a pre M51640 engine with 500 hours. No issues to date. Should I address this?… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,328 satisfied customers
i'm looking into buying a boat with twin 2002 yanmar 370 hp's.
i'm looking into buying a boat with twin 2002 yanmar 370 hp's. what do you think of those motors?… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,328 satisfied customers
James, i need you to help me.I want to buy a boat with 2 yanmar 6LPA/STP (315HP). 50
Hello James, i need you to help me.I want to buy a boat with 2 yanmar 6LPA/STP (315HP). 500 hours.year 2004 Are you sure that if the color of the valve are grey I will have problems?. Thanks if you an… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,328 satisfied customers
I am looking at purchasing a Albin Express Trawler in Monterey.
I am looking at purchasing a Albin Express Trawler in Monterey. It has the Yanmar 6LP-STE engines that apparently were a subject of a recall and law suit. Can you confirm with me that these engines we… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
19,328 satisfied customers
Just building new boat twin engined was going to specify
Just building new boat twin engined was going to specify the yanmar by260 like the engine (BMW) super light and reliable but very worried about the leg Has the 370 leg proved to be as reliable as the … read more
Jason
Jason
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Vocational, Technical or Trade School
19,328 satisfied customers
I am looking at buying a boat with a 330 hp Yanmar connected
I am looking at buying a boat with a 330 hp Yanmar connected to a Bravo 3. I have read bad things about this combo. Should I be concerned?… read more
Jason
Jason
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Vocational, Technical or Trade School
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What is the problem with the Yanmar 6LPA-STP/STZP 315 HP motors
What is the problem with the Yanmar 6LPA-STP/STZP 315 HP motors with serial numbers ranging from 50101 to 53988. Is there a fix and who should perform it ?… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
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have twin 6lpa stp engines, about 1100 hours each,port engine
have twin 6lpa stp engines, about 1100 hours each,port engine blew up are these eng,part of the law suiet,eng numbers m 51934 AND 51919 BOAT ABOUT 8 or 10 yrs old ? also need a new or rebuield asap.Bo… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,399 satisfied customers
I have 2004 Yanmar 315 6LPa diesells with 965 hrs. well maintained.
I have 2004 Yanmar 315 6LPa diesells with 965 hrs. well maintained. The Starboard engine sounds and runs like a new sewing machine. The port engine runs fine.. 3800 rpm vs 3800 starboard. but sounds r… read more
K. Kergan
K. Kergan
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Vocational, Technical or Trade Scho
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I have a 375 hp yanmar diesel engine in my boat. the boat
I have a 375 hp yanmar diesel engine in my boat. the boat holds 250 gal and was a little over 1/4 full (approx 70 gal) when 120 gal of marine gas was added. The boat was then run on the diesel/gas mix… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
My almost new 2007 Yanmar marine diesels 315s have smoked
My almost new 2007 Yanmar marine diesels 315's have smoked from the day I bought the boat until now. It's blue and and is pronounced when the engines are cold.… read more
Capt.Cory
Capt.Cory
LICENSED CHARTER CAPTAIN
High School or GED
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Hi, My twin Yanmar 6LPAs have the ticking sound upon deceleration
Hi, My twin Yanmar 6LPA's have the ticking sound upon deceleration described in websites as preliminary to catastrophic engine failure. Motors have 1100 hours. Is there a website I can print out the i… read more
Expert
Expert
deisel outboard motors,I have a 35 ft. searay with twin yamaha
deisel outboard motors,I have a 35 ft. searay with twin yamaha 250 gas engines and was thinking about changing to deisel out boards.What I want to know is if it is feasible to do so I need the power a… read more
Yachtwork
Yachtwork
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Technical or Trade School
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I have a pair of Yanmar 240 HP with 780 hrs on them. The exhaust
I have a pair of Yanmar 240 HP with 780 hrs on them. The exhaust elbows on port engine just rusted through and came apart and filled the engine room with thick black smoke on my MAINSHIP 40. I can see… read more
Professor Diesel
Professor Diesel
Proprietor
Vocational, Technical or Trade Scho
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I have a 27 Center Console Boat that is powered by a YANMAR
I have a 27' Center Console Boat that is powered by a YANMAR (DIESEL). MODEL 315 6LPA-STP. The Motor runs perfect but the Alternator keeps on Crashing when I turn on the "Radar" "Depth Sounder" and "P… read more
Yachtwork
Yachtwork
Owner Team Yachtwork
Technical or Trade School
1,048 satisfied customers
I have a Monterey 302 with twin 5.7L engines which have approx
I have a Monterey 302 with twin 5.7L engines which have approx 120 hours on each. When running the boat and both engines are at the same rpm's the oil pressure on one engine is showing as much higher … read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
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I HAVE TWIN cUMMINS DIESELS 270 HP ON MY BOAT. tHE ...
I HAVE TWIN cUMMINS DIESELS 270 HP ON MY BOAT. tHE PORT ENGINE MAKES A CLATTERING SOUND, ESPECIALLY AT IDLE SPEED. MIGHT THIS BE DIESEL KNOCK? SHOLD i BE CONCERNED ABOUT IT?… read more
BC Boat Guy
BC Boat Guy
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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