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Upon examination for winterizing both my shrinkwrap
Upon examination for winterizing both my shrinkwrap installer and myself were unable to find the lower unit oil drain screw. This is a two season old mercury 4 stroke 90 hp. I have been changing gear … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
Have a 25 HP Mercury and the top of the lower unit is turning white after use. It seems to
Have a 25 HP Mercury and the top of the lower unit is turning white after use. It seems to be pumping water correctly. What does this indicate other than overheating. Engine only less than 15 hours on… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
Change the oil in my 1981 OMC I/O unit several times but am
Change the oil in my 1981 OMC I/O unit several times but am now finding it difficult to order the O-ring replacements (2 sizes), the 8090 weight necessary to go back in and gaskets for the gear box th… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
Hi! I have a 3.0L Mercruiser (mounted in a Bayliner BR 175
Hi! I have a 3.0L Mercruiser (mounted in a Bayliner BR 175 -2003). I recently bought the boat and as it is my first boat ever I no little about how things work. Anyway, yesterday I took a more detaile… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
I have a 2000 mercruiser bravo one outdrive lower unit that
I have a 2000 mercruiser bravo one outdrive lower unit that Iam trying to put on a preXXXXXunit. The 2000 upper has an oil passage that comes from the drive bearing down to the lower unit,is this just… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
I have purchased 1996 Chaparrel Deck Boat with a 185 hp V6
I have purchased 1996 Chaparrel Deck Boat with a 185 hp V6 Mercruiser this year. It did not come with a complete set of manuals, therefore this problem I'm winterizing it and have a concern about pote… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
Have a 20 hp mercury serial #4957526 around 1978 I think. Had
Have a 20 hp mercury serial #4957526 around 1978 I think. Had a piece of wood wedge the prop and stop it, now it will turn but when throttling up it sounds like it is trying to jump gears. Diagnosis p… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
Recently bought an older 6hp Merc. For maintenance, am I changing
Recently bought an older 6hp Merc. For maintenance, am I changing oil once a year, or lube. Many thanks… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
have a tracker motor 50hp does this motor have a low oil warning
have a tracker motor 50hp does this motor have a low oil warning where do you check lower unit oil what type of oil is recamended oil in motor is full and has been changed recently thank you for your … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a 65 H.P. triumph. The lower unit appears to be 2 stage.
I have a 65 H.P. triumph. The lower unit appears to be 2 stage. I see the drain and filler plugs for the bottom, but all I see for the upper half is the drain plug. How do I fill the upper half, if it… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I am taking my boat out of storage it is a 2006 4.3 Liter
I am taking my boat out of storage: it is a 2006 4.3 Liter fuel injected merc cruiser. Whe I winterized the boat I took off the two blue plugs on front of engine and opened the blue valve to drain wat… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
i have a 2007 merc 250 pro xs. went to change the lower unit
i have a 2007 merc 250 pro xs. went to change the lower unit lube and it smelled real bad like gear lube. i have always used merc prem plus. any ideas?… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
Is there any lower units (different H.P.) that would fit a
Is there any lower units (different H.P.) that would fit a 1984-1986 90H.P. Mariner 6 cylinder serial #(NNN) NNN-NNNN? Drive shaft measures 22 1/2" face of unit to tip of shaft, and prop shaft 15 spli… read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
I have a 2000 454 Merc with a Bravo 3 outdrive. Recently the
I have a 2000 454 Merc with a Bravo 3 outdrive. Recently the drive has begun making a whining noise which can be heard above the engine and the whining noise increases with rpm. Also gear lube is push… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
I have a 1996 20 baja outlaw w/350 mercruiser eng-stock- with
I have a 1996 20' baja outlaw w/350 mercruiser eng-stock- with a 144 series weind supercharger,750 holley carb.The boat ran great until last year. It wouldnt plane out from the start Once the boat pic… read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
I have a 2002 Chapparral with 4.3 V6 and Alpha 1 outdrive.
I have a 2002 Chapparral with 4.3 V6 and Alpha 1 outdrive. It is leaking a little gear oil where the lower unit bolts to the upper. I had to add a little oil to the reservoir. I checked the oil level … read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
I have two 225 Saltwater mercs optimax year 2000. I do not
I have two 225 Saltwater merc's optimax year 2000. I do not know where the drain plug or top vent plug. can you help me?… read more
FieldServiceTech
FieldServiceTech
Vocational, Technical or Trade Scho
146 satisfied customers
Recently I discovered a pool (about 1/2 pint) of lower unit
Recently I discovered a pool (about 1/2 pint) of lower unit lube under the lower unit of my 88 Merc stern drive. I traced it back to the area of the clutch dog. I had changed the fluid and taken it ou… read more
davesoutboard
davesoutboard
owner
Associate Degree
1,570 satisfied customers
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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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