i have a c34, 1986, hull 99. i had a new shaft put on a few years ago, and the prop straightened. i ran her aground, into soft sand, over a year ago, and she's been fine since then. i took her out once, for about 15 minutes of motor and 4 hours of sail, a few weeks ago and then I took her out for a very long (1.5 hour) motor yesterday. this is the only time i've taken her out, this year. the engine was extremely loud and vibrated a ton. the rpm's did not seem out of wack. i'm exhausted from the motor yesterday, espcially in my arms. the coolent reseviour, which was put on a few years ago, shook enough to spew coolent all over underneath the sink, in the head. Outside of diving down and looking at the prop, to see if anything is on it, what else can I do before I have to spend real boat bucks, getting her hauled out and looked at?
thanks
becki kain
detroit
becki I think you have an M-25?
wither her running, try cracking and backing off the injector line one at a time so that that cylinders injector isn't getting fuel -- to see of the RPM chamges. You might have her running on one or two cylinders?
KK
thanks Ken, how do you do that? yes, she's an M25 kabota tractor engine. i should have said that.
Beki, also check the motor mounts to see if any are separated or broken,
Mike
Quote from: anaisdog on July 13, 2015, 01:45:11 PM
thanks Ken, how do you do that? yes, she's an M25 kabota tractor engine. i should have said that.
Loosen the compression nut on the tubing that feeds each injectors, one at a time. Yoru engine parts manual will show the fuel lines going to the injectors. Best to use a "tubing wrench" or "flare nut wrench" for that ($12 set at Harbor Freight) -- less likely to round off the nut (they need to be very tight) than using an open-end or adjustable wrench on the nuts. Note that it will be a Metric size, not Imperial size wrench. The theory being that if you have a cylinder not "firing", when you interrupt the fuel flow, you won't notice a difference. You WILL notice a difference if you interrupt the fuel flow to a good cylinder. Put plenty of paper towels around the nut to catch the diesel spray.
KK
becki : You didn't say, but is this happening all the time the engine is running?
Both in gear? and out of gear??
both. it was REALLY loud and really vibration-y. i'll try to find the motor mounds then, thanks
Quote from: anaisdog on July 13, 2015, 02:14:06 PM
both. it was REALLY loud and really vibration-y. i'll try to find the motor mounds then, thanks
parts manual - probably called "isolation" mounts or engine isolaters.
k. i'll find the m25 manual and look for them if the manual is not onboard. thanks!
Quote from: anaisdog on July 13, 2015, 02:23:45 PM
k. i'll find the m25 manual and look for them if the manual is not onboard. thanks!
yep - M25/M25XP/M25XPA parts manual, not owner's manual. It's on the C34 site and C30 site.
k
it is? oh, duh!
becki: Pull the steps out and look at the engine. In the front you'll spot (on each side) where the engine sits on the rails (one on each side) attached to the floor under the engine. 2 engine mounts in front (one on each side) and 2 in the rear (one on each side)
I'm sure that you have a bad mount(or two or three) and/or a locking nut/s on two (or more) have backed off (or missing!!) and the lower adjusting nut/s are all out of whack!
Think you need to get someone that knows about engines to look at it for you!!!!!! duh!!!
My thoughts
the problem is, the man mechanic in the area and i have had a little of a falling out.
also, Ron, that would make sense since my crew reminded me that when he stood on the stairs, the vibration seemed to be a lot less. i'll look wednesday. work is in the way of getting to my boat!
Quote from: anaisdog on July 13, 2015, 02:49:53 PM
also, Ron, that would make sense since my crew reminded me that when he stood on the stairs, the vibration seemed to be a lot less. i'll look wednesday. work is in the way of getting to my boat!
Becki,
One of the old, old, old tips & tricks was to put four stick-on felt coasters, like for a glass. living room coffee table under the bottom of the top step section.
Probably comes from the old FAQs in the C34 Tech wiki.
Given your situation, I suggest looking again at the Critical Upgrades, "Look at your engine while it's running." Take BOTH covers off and watch what happens.
I'm still runnin' on 30 year old mounts. I'm certifiably crazy. But, I do like to know what's happening down below and I can feel it through my feet standing behind the wheel. :D
We have a newer 100A alternator with a Balmar external regulator with a Small Engine Mode toggle switch. Check your electrical system and let us know what you have. Like, OEM alternator, etc.
Becki : From your description of the engine vibrations that you are getting, you don't need a master mechanic to look at your engine for the indications that I mentioned above.
I might be wrong, but if you have "out of alignment" problem? it should be quite obvious.
If not alignment, then a mechanic needs to check and see if your engine is "firing " on all 3 cylinders!!
Some more thoughts
i will have to figure out how to do that. thanks
it wasn't the motor mounts. they were tight. mechanic and "dad" thought it was the belt. mechanic tightened. we'll see how it goes
thank you to all
:santa
Quote from: anaisdog on July 17, 2015, 09:35:31 AM
it wasn't the motor mounts. they were tight. mechanic and "dad" thought it was the belt. mechanic tightened. we'll see how it goes
thank you to all
:santa
You DO HAVE the upgraded alt mount, correct? When the old one gets loose and vibrates, it can sound like all hell's breaking loose.
k
no idea. the mount bolts were tight
Quote from: anaisdog on July 17, 2015, 10:51:21 AM
no idea. the mount bolts were tight
pic of the alt then?
Quote from: KWKloeber on July 17, 2015, 06:03:51 PM
Quote from: anaisdog on July 17, 2015, 10:51:21 AM
no idea. the mount bolts were tight
pic of the alt then?
OR, is the adjusting bracket above or below the alternator?
k
That would be covered here, and in Critical Upgrades
http://www.c34.org/wiki/index.php?title=M-25_Alternator_Mount_Conversion_Kit_%22B/M_256891%22 (http://www.c34.org/wiki/index.php?title=M-25_Alternator_Mount_Conversion_Kit_%22B/M_256891%22)
i am terrified to ever turn the boat on again :-(