| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 131.1 | New Motor | DIXIE1::WILKINSON | Melted Snow Skier | Thu Aug 25 1988 10:27 | 18 |
| The power head is the "motor" part of the ob, the foot being the
tranmission part of the motor. It would include the block, pistons,
head. Probably not the carbs, exhaust, ignition. Reasons for
replacement would be a "blown" ruined engine maybe by overheating
or no oil in the gas. I would think this would be a good sign in
looking for a used motor. Even though it may have been abused at
some time, it is new now.
Questions to ask:
1. What is the cause of powerhead replacement?
2. Is it a rebuilt powerhead or is it a factory replacement?
(factory being better)
3. Did an authorized dealer do the work and is it warrantied?
4. How many hours on new powerhead?
Nelson
(owner of a used boat and rebuilt ob)
|
| 131.2 | "Scientific" facts to be aware of!!!! | NETMAN::BAER | Garry Baer | Wed Sep 07 1988 16:30 | 13 |
|
It is a proven fact that water causes a boat to "shrink" and "require"
more HP that one initially thought was neccesary!!! (9 out of 10 boat owners
surveyed agree). Factor your average # of guest's, their baggage, proper
refeshment capacity, enough ponies to pull that 14 year-old "Mike Synider"
superstar on 1 ski, into your requirements. One can buy a lot more boat at
this time of the year for the same money of a smaller boat in the Spring/Summer.
Things like a large gas tank, under/indeck storage, interior room to
move and HP are the usual reason a "starter" boat is traded in within 2 years
of purchase.
Garry
|
| 131.3 | | TOOK::SWIST | Jim Swist LKG2-2/T2 DTN 226-7102 | Tue Jun 25 1991 12:47 | 8 |
| Here's an outboard powerhead question.
What is the difference between a "loop-charged" and a "cross-charged"
engine? One gets the impression that loop charging is a feature and
cross charging is standard but that doesn't help much if you don't
know what they mean to begin with.
|
| 131.4 | | DNEAST::OKERHOLM_PAU | | Wed Jun 26 1991 13:40 | 8 |
| Jim,
Loop charging causes the gases to swirl in the cylinder. Is
accomplished by the shape of the top of the piston, among other things.
Its supposed to result in more complete burning and less wasted fuel.
Cross charging is just the basic "suck it in and push it out"
technology that's always been around.
I can get more detailed if you really want to know.
Paul
|
| 131.5 | Mercury Powerhead Question | KAHALA::SUTER | Never too Hot! | Mon Jul 12 1993 14:12 | 48 |
| Moved by moderator
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<<< VICKI::SIE$DATA1:[NOTES$LIBRARY]BOATS.NOTE;1 >>>
-< Powerboats >-
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Note 1072.0 MERCURY POWERHEAD QUESTION No replies
NOPROB::COMEAU 39 lines 12-JUL-1993 12:55
--------------------------------------------------------------------------------
Have a few questions about a Merc outboard. Its a 1981 90HP.
The water pump quit and the engine conked out had to be towed in
down in Hyannis.
(Great towing company called "Small Boat Towing" that the Coast
Guard put us in touch with)
The boat dealer tore down the engine and he says the # 3 cyl
is fried.
Question
The estimate is $1500 to rebuild powerhead (if rebuildable)
About 18 hours labor at app. $50 per then the rest in parts
Does this sound reasonable?
Can the cyl be bored/honed and just 1 piston replaced??
Is a complete rebuild the norm for this type of failure??
Any sugestions would be helpful and appreciated.
DAC
|
| 131.6 | Sounds expen$ive (to me). | ASDS::BURGESS | Waiting for ZEUS to come | Mon Jul 12 1993 15:21 | 68 |
|
> Have a few questions about a Merc outboard. Its a 1981 90HP.
> The water pump quit and the engine conked out had to be towed in
> down in Hyannis.
> (Great towing company called "Small Boat Towing" that the Coast
> Guard put us in touch with)
> The boat dealer tore down the engine and he says the # 3 cyl
> is fried.
This is a very imprecise term - what means "fried" ?
> Question
> The estimate is $1500 to rebuild powerhead (if rebuildable)
> About 18 hours labor at app. $50 per then the rest in parts
> Does this sound reasonable?
Not to me, but I'm not trying to make a living at it (-:
Somehow OVER TWO FULL WORKING DAYS sounds like a lot of time
to spend directly on rebuilding a 3 cylinder 2 stroke.
> Can the cyl be bored/honed and just 1 piston replaced??
Dunno, it depends on what "fried" means. I'm out of date
on all this stuff, but it used to be that honing could be done without
pulling "everything" apart - whereas boring required stripping down to
a naked block - "real machining" work.
> Is a complete rebuild the norm for this type of failure??
How bad is "bad" ?
> Any sugestions would be helpful and appreciated.
Well, I'd try testing the integrity of this dealer by asking
what the other $600 for "parts" gets me. OK, all the gaskets to
reassemble it with - what else ?
Also I'd check around to see if $50 an hour is the going rate for labor.
Lastly, or maybe "firstly" I'd go shopping for a used power head -
this is the time of year for people to be wiping out their lower ends on
rocks (lotsa newbie boaters out there this year) so you might be able
to pick up an outboard with a trashed lower unit for the proverbial
"song". My guess is that just swapping power heads doesn't take very
long and doesn't take much skill.
> DAC
Reg (shade tree)
|
| 131.7 | said the spider to the fly | USCTR1::BORZUMATO | | Mon Jul 12 1993 15:59 | 19 |
|
I like Reg's idea. One of the bigger reasons is that i have never
seen an outboard rebuild go far. I don't know why, but for one reason
or another they don't make it.
I would suggest you a. buy a new head.
B. buy the remains of a low-unit fatality.
I would not invest $1.5k in a 13 year old outboard.
Excuse the word "invest" i slipped.
JIm (reg's shade tree brother)
|
| 131.8 | Sorry...the devil made me do it.... | COAL05::WHITMAN | Acid Rain Burns my Bass | Mon Jul 12 1993 18:44 | 19 |
| <....
<
< JIm (reg's shade tree brother)
<
<
Nah!!! More like Reg's shade tree:-):-):-)
Jim,
I figured you'd have opened the Hardware Store in southern Florida by now
that you & I discussed about 3 years ago (just before I took this job in Calif.)
Just can't give up N.E. waters I can you....
Al
|
| 131.9 | buzzards bay not named after a pigeon | USCTR1::BORZUMATO | | Tue Jul 13 1993 08:29 | 4 |
|
Hey Al, time flies (3 yrs.)
JIm
|
| 131.10 | TOTAL FOR REPAIRS TO POWERHEAD | NOPROB::COMEAU | | Fri Aug 06 1993 10:25 | 33 |
|
Well, for anyone who may be interested the bill is due on the
Mercury powerhead mentioned in the previous replies.
Parts 509.00
Gaskets
piston assmby
rings for all cyl
waterpump
misc little
Labor 650.00
hone cyls
rebuild carbs (don't know why)
install waterpump
reassmbly powerhead
test and tune
Total 1150.00 +
We're back on the bounding main(sp)
DAC
|
| 131.11 | WATER PUMP FAILURE PREVENTION??? | NOPROB::COMEAU | | Fri Aug 27 1993 10:00 | 22 |
|
The 1981 90hp Merc that was rebuilt seems to be running fine.
My father-in-law is a little gun-shy about runnig it and he
constantly goes to the back of the boat to check the water pump
output stream to make sure its still pumping.
Question.
Is there a kit to provide a warning if the pump fails.
A gauge, light or audio alarm ?
DAC
|
| 131.12 | Pressure gauge | SUBSYS::CHESTER | | Mon Aug 30 1993 13:28 | 5 |
| Actually yes. There is water pressure gauge for the cooling system. I
don't know any of the details. Other than it connects to the output
side of the water pump.
KC
|