Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [boat]

Questions about boats, boat engines, and other relevant (mechanical) questions about watercraft

Mechanical/engine related questions about boats are considered on-topic. Non-mechanical questions, such as fixing sails, aren't.

55 questions
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Does engine oil get old and go bad?

Does engine oil actually go bad from just sitting within an engine that's not getting use? I feel conventional motor oil has been sitting underground for millions of years prior to being extracted and refined. But I have a 1995 Mercruiser 350 (small…
Travis
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11
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4 answers

Starting a 2 stroke jet boat after several years

The parents in law gave me a jet boat, it hasn't been started in 5 years. The boat resided in NH on a trailer on their yard for 5 years, so it has seen freezing temperatures frequently. From what I understand, 6 years ago the boat ran fine at the…
Calvin
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9
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2 answers

Carb. Rebuild or Adjustment?

Just put a rebuilt 2 stroke and brand new Mikuni SBN carburetor in my jet boat. Got her running no problem the first couple times, now it seems I can't get any gas into the carburetor from the primer bulb. The primer gets very firm and I am…
Calvin
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9
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What is the yellow precipitate in my outboard's carburetor?

I've got a 2008 Tohatsu 9.8 HP four stroke outboard. My low speed jet keeps getting fouled and on several occasions, I've found yellow almost crystalline "growths" for lack of a better word inside the carburetor. They look like tiny sulfur…
delliottg
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7
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1 answer

DIY Alternator Belt Tensioner

I've got a diesel engine in my boat, but the previous owner had somehow snapped the alternator bracket, and fitted it fixed to the boat rather than the engine. Now the alternator doesn't move when the engine rocks putting strain on the belt. The…
Adam
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6
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2 answers

Is there such a thing as a biodegradable (boat propeller shaft) grease?

I'm using a Volvo Penta Propeller Shaft grease to to lubricate and seal the propeller shaft in my boat. The grease eventually gets "squeezed" out from the various lubricated spots and ends up in the keel. The grease gets pumped out into the ocean…
sbrattla
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6
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3 answers

Boat Not Getting Power to the Starter Motor

Just rebuilt most of a 2 stroke jet boat. ( if you need / want any boat details, see: this thread ) First day the boat started fine, no problems, next day I tried again and the CDI fuse had blown ( see this this thread for details ) Yesterday, day…
Calvin
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5
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1 answer

What RPM to check timing?

I've got a question about my 1985 454 Mercruiser engine. I'm trying to adjust the timing but when reading through the engine manual it sounds like it's giving contradicting information. On page 27 is states: Timing (at Idle rpm) 8° BTDC On page 354…
Dehli
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5
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2 answers

Where Does My Boats Main Negative Battery Terminal Wire Go?

Just rebuilt most of a 2 stroke jet boat. ( if you need want any boat details, see: this thread ) When I purchased the boat, the thickest negative battery terminal wire was not connected to anything. This is literally the last connection I have to…
Calvin
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5
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1 answer

Which engine part is this?

I own a speedboat that is powered by a 5 liter V8 Mercruiser with 200bhp. Yesterday when trying it out for the 1st time this season, 2 things happened: 1 - the boat was always trying to turn left and the steering wheel was offering a lot of…
Andre
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4
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4 answers

Why do I connect the positive and the negative to the battery on a boat?

My trolling motor for my boat has a black and a red connection. The red goes to the positive on the 12 volt battery. The black goes to the negative on the 12 volt battery. Could I connect the black to the giant metal boat I am driving, and then…
USER_8675309
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Re-wiring Harness in Jet Boat w/ Ford 460

I'm replacing the wiring harness on my jet boat. It has a Ford 460 in it. The boat has five gauges on it. A tachometer, oil pressure, amperage, fuel gauge, and water temp. There is also a toggle switch which powers the ignition and a push button…
gh0st
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3 answers

1999 Yamaha 80hp Outboard Electrical Problem (Rectifier Overheating)

I recently purchased a pontoon boat and on day #3 my motor died, I'm hoping to get some help from the community with correctly diagnosing and fixing the problem. The motor - 1999 Yamaha 80hp four stroke (F80TLRX). The problem - 30A fuse is blown,…
Barry
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How to wire an ignition switch for boat throttle controller

I have an old Bass Tracker boat. They no longer make the throttle controller for the boat, but I need to replace the ignition switch (which is in the throttle controller). I looked online and this product looks about the same as the ignition I…
Douglas Johnson
4
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1 answer

Engine Turns but won't start

It's an old Renault 4-cylinder carburetor engine in a boat. I don't know much about engines so let me know if I'm not including important information. The boat is old but new to me. I drove it for about 4 hours, but now it won't start. When I…
Peter
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