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engine maintenance

Old 02-24-2009, 05:36 PM
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Default engine maintenance

I have twin 2002 yamaha's 250 ox66, they currently have 800hrs on them and I keep my boat in the water, I have not done any maintenance to them in about a yr(100 hr service) and I 've tagged on another 140 hrs. My boat is running perfectly, and I use it at least once a week, I'm thinking of going to bimini and maybe chub cay next month. Should I do the service. Did I mention my mechanic wants $1380 to haul out and complete the service
Old 02-24-2009, 05:55 PM
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Default Re: engine maintenance

Can you get a lift and do it yourself?

When were the water pumps/thermostats last serviced? If these haven't been recently, you might consider...

Water pumps
T-stats
Gear oil
Spark plugs
Change your fuel filters
You may want to change the oil strainer on the bottom of the remote tank just before the pump
Old 02-24-2009, 05:59 PM
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Default Re: engine maintenance

the thermostats were done 140 hrs ago, it looks like they pee pretty good though, I can change the filters and thermostats myself, but I've never dropped the lower unit. How hard is it??
Old 02-24-2009, 06:01 PM
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Default RE: engine maintenance

I'm sorry I ment the impellers were changed 140 hrs ago.
Old 02-24-2009, 06:06 PM
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Default Re: engine maintenance

If the impellers were changed 140 hours ago, they're fine. You won't have to drop the gearcase for anything else.

T-stats are very easy. Change them.

Gear oil is a cakewalk, and plugs are a no brainer, too. Get it done, and don't risk a break down because of a routine maintenance item.
Old 02-24-2009, 06:13 PM
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Default Re: engine maintenance

I appreciate the help yamahafan,
How long are the impellers good for? Also can I change the gear oil with the boat in the water.
Old 02-24-2009, 06:37 PM
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Default Re: engine maintenance

Get on a jetski or float, put kitchen size trash bag over the lower unit, and let the bag catch the oil. Not easy, but keeps you from hauling out. I've done it a bunch of times. Bring rags with you.
Old 02-24-2009, 06:46 PM
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Default Re: engine maintenance

will this work although the engines are tilted up? I"ll try doing it tomorrow.
Old 02-24-2009, 06:54 PM
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Default Re: engine maintenance

I would recommend taking the boat out of the water for lower unit lube change. Doing it in the slip allows the potential for leakage, which besides being terrible for the environment, is a MONSTROUS fine if you are caught discharging oil...even if it is an accident. Secondly, when you're refilling the gearcase, you would almost certainly lose oil in the water, not to mention that the gearcase should be vertical when you are filling it from the bottom up. I believe the above post is bad advice.
Old 02-24-2009, 07:02 PM
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Default Re: engine maintenance

yamahafan,
My apologies. I assumed the boat was on a lift. If actually in the water? NO! My bad...
Old 02-24-2009, 07:03 PM
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Default Re: engine maintenance

Delete.
Old 02-24-2009, 07:06 PM
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Default Re: engine maintenance

Osprey, good catch. Changing gear lube in the slip would be impossible, and a train wreck making an attempt. Hopefully, the original poster reads this prior to tilting them up and changing the gear lube slip side.

Should be interesting.
Old 02-24-2009, 07:08 PM
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Default Re: engine maintenance

I will work on borrowing a trailer, thanks
Old 02-24-2009, 07:14 PM
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Default Re: engine maintenance

Great idea. You should be able to do t-stats, gear oil, plugs, fuel filters, and the remote tank oil filters inside of a couple hours. This will save you a ton of money over having a dealer do it, and you'll have no maintenance worries for a while. Impellers should be good for 300 plus hours. If you're not a several hundred hour per year user, I would change them every other season...along with t-stats.
Old 02-24-2009, 07:54 PM
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Default Re: engine maintenance

I have changed the gear oil with the boat in the water and engines tilted up. Naturally you won't get every drop out but its close enough.

Here is how I did it. I have one of those 4' X 8' floating work platforms. With the engines tilted all the way up I can get the gear cases over the floating platform. Its a tight squeeze but it helps keep everything in one place.

Then I rig the lube pump suction side to the drain plug and pump the oil out into a container. Then reverse the pump to refill. Not a drop in the water.

I don't do it anymore because the E-Tecs can go longer than my old engines. I used to like changing the gear oil in them about every 50 hours because they were old.
Old 02-24-2009, 11:42 PM
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Default Re: engine maintenance

http://www.switchbait.com/forums/showthread.php?t=327
all charts
Old 02-25-2009, 01:49 AM
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Default Re: engine maintenance

Not to give you more work but I would consider doing a little more maintenance before heading across the stream. For instance:

1> t-stats definitely. I change them every year whether they need it or not.
2> Low pressure fuel pumps if you've never changed them.
3> Fuel filters all around. 10 micron, bowl & VST.
4> Plugs.
5> You may also want to clean the O2 sensor.

None of the above are very expensive and can be done while in the water.

Have a great trip!

Oops! Sorry yamahafan, I just noticed that I seemed to overlook your post...
LB
Old 02-25-2009, 04:18 AM
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Default Re: engine maintenance

It sounds as if I can save some money, worth a try. Worse case I can always get it fixed by a tech.
Old 02-25-2009, 05:47 AM
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Default Re: engine maintenance

One more note, don't overtighten spark plugs or gearcase plugs. You can fairly easily strip those components, and they are a pain in the ass to fix.
Old 02-26-2009, 05:59 PM
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I found a licensed and insured mechanic working on a boat in my marina that is willing to haul out the boat, change the impellers, replace the spark plugs, change the lower unit oil and grease the prop for $180 an engine. (I supply the plugs) He will also replace the thermostats for at $25 each parts and labor.
Anything else I can pretty much do myself and this resolve the issue with the trailer.

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