Rebuild or Repower?

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Randy Burns

Randy Burns

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Jun 5, 2004
160
Hunter 27_73-83 Harrington, Maine
Seems like when you read about diesels, the experts all comment "they last 30 years" - well, in a month my YSB8 Yanmar will be 30 years old - Parts are still readily available to rebuild, but is it an obsolete beast? I'm new to diesels and would be interested in anyones thoughts.
 
Ed Schenck

Ed Schenck

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Jun 2, 2004
5,802
Hunter 37-cutter, '79 41 23' 30"N 82 33' 20"W--------Huron, OH
It's a financial question.

For me it is a question of dollars. The H27 needs a bigger motor as does my H37C(20 hp). A new diesel will be smaller, lighter, and more reliable. It will also be quite expensive with new mounts, new shaft, and labor. Guesstimate at least $8000. However a rebuild is also not inexpensive. And you end up still being underpowered and might not gain any reliability. I also see that you live in the frigid north as I do. So in effect your engine is only fifteen years old. Is the engine power sufficient for your sailing grounds? Then you could do what I am doing. Wait until it breaks.
 
Rick

Rick

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Oct 5, 2004
1,098
Hunter 420 Passage San Diego
Yanmar Rebuild

I too have debated this issue and received the same advice, "diesels last forever". Just bought my 1979 Hunter 30 and it is really tired. Without even knowing if the engine ran, I decided to pull it and open it up. As I expected, it too was really tired. As you are aware, and I am impressed, Yanmar parts are still readily available, a bit pricey but available. My guesstimate is it will be roughly $1500 to replace all major components(including sleeve & piston. Underpowered.... probably. $1500 as compared to $8000 I'll live with it. I am a total novice and will be the first to admit I ain't got a clue but I'll offer any pictures of what to expect if you decide to rebuild. A digital camera is a lifeline. toyroom@ns.sympatico.ca
 
Rick Webb

Rick Webb

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Jun 2, 2004
3,566
Hunter 23.5 Fort Walton Yacht Club, Florida
Don't Discount the Third Option

Hang an outboard on the stern. Some seem to think of it as a sacrilegious but it is done all the time.
 
Rick D

Rick D

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Jun 14, 2008
7,187
Hunter Legend 40.5 Shoreline Marina Long Beach CA
Run It

Unless there are problems internally, I'd be inclined to just run the thing. If not, I'd rebuild it. It isn't that complicated. Just my opinion. RD
 
Randy Burns

Randy Burns

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Jun 5, 2004
160
Hunter 27_73-83 Harrington, Maine
Good information

I did't mean to imply mine was two cylinder, its an 8 hp single, and I bought the boat as a project with the motor siezed. A previous owner,also a Mainer, traveled all over with it, including Halifax and thought the motor adequate. I was thinking the new 1gm was a full 10 hp, and I would be picking up a couple of HP, I guess I was wrong about that, the specs say 9hp. I have a heck of a lot of current to deal with up here having enough power most of the time might not be enough of the time...(OK, Im a chicken)
 
B

Bill Edmundson

Engine Options

I ran some prop calcs for you on boatdiesel.com. Assuming 7000# + 2000#(water/fuel/gear/and a couple of fat boys)=9000# The 1GM10 w/2.62 reduction and a 13x8 prop will give you 4.9 kts. max. & 4.7 kts. cruise. The 2YM15 w/2.62 reduction and a 13x10 prop will give you 5.7 kts. max and 5.5 kts cruise. According to their calculator it takes 17.9 hp to get hull speed of 6.3 kts.
 
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Pat McCartin

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Jun 3, 2004
347
Hunter 30_74-83 Lake Lanier, GA
Adding to the assumptions....

Assumeing you've decided that weight isn't and issue, then I have other recomendations. First I must say, in the sub 100hp class of engines it doesn't mater whos it is. They are all equal in relialibity. You are buying the quality of service and warranty at this point. This range is the most competitive in the market place. On to recomendations. 1st Westerbeke 20B2 239# 17hp cont. 30# torque @2200 2nd Universal M3-20B 241# 19hp cont. 33# torque @ 2500 3rd Yanmar 2YM15 227# 12.9hp cont. 26# torque @ 2400 Of these, if you can fit the 3cylinder Universal it will be somther than either of the 2 cylinder models. All 2 cylinder engines are set up with the pistons 180' out of phase. Where a 3 cylinder has the pistons at 120' intervals. This allows for smother transition of power to the crank and less vibration. In the 2 cylinder engines one piston is up and the other down. The dynamic is they are always fighting each other. I still maintain a 1GM is plenty, but I sail diferently. Pat McCartin Inland Marine Diesel Buford, Ga imd_ga@hotmail.com
 
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tmason

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Jun 11, 2004
29
Hunter 27 Cherubini Middle River
Repower

I replaced an SB8 this summer with a new Westerbeke 11A One, and the gain in performance and comfort was nothing short of amazing. We can now carry on a normal conversation in the cabin while under power. Vibration is nonexistent above idle. The Westerbeke is rated at 10.7 HP, or about 25 percent more powerful than the Yanmar, but the gain seemed much higher. My very tired SB8 must have been an SB5 at the end. I paid $3,200 for the Westerbeke, a one-lunger. It's discontinued, and dealers are unloading them. Westerbeke won't stock parts for this engine after it sells them out. But the motor is actually a German-built Farymann 32W. The East Coast Farymann dealer is PRP Inc. in Whiting, N.J.
 
B

Bob

Consider a Vetus!

I put a Vetus 3 cyl, 25HP in my 1976 Hunter 30, and I am tickled pink with it. I had to change the prop, because of the opposite rotation, I used a 3 bladed prop, and old rover moves through the water at about 7 - 7 1/2" knots with a clean hull at about 1800 RPM's. I used about 6 gallons of diesel this summer. I has a two year warranty. If your interested search the web for 1-800-runs new
 
Randy Burns

Randy Burns

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Jun 5, 2004
160
Hunter 27_73-83 Harrington, Maine
Interesting

My latest thinking is to go with a rebuilt 2GM20F, it will save me over $2500 when compared to the GYm 15, and if I ever have to sell I'd like to get my money out of the boat (Yeah, sure). I did get a quote on a Vetus 16 hp, about $600 less than the new Yanmar 15 and I didn't think that was enough savings when considering all the yanmar dealers that are around. (Who all charge exactly the same for their product, but thats a story for another thread) Anyway, I change my mind weekly, at least until I put my money where my mouth is. FYI -I found a great site if anyones is considering a restoration
 
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Pat McCartin

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Jun 3, 2004
347
Hunter 30_74-83 Lake Lanier, GA
Randy,

You'll need a transmission to go with that rebuilt 2GM. The one on your YS won't fit. This change will also require changing props. The YS is a lfet hand rotation and the newer gear are right hand. Thre are a few new "old" stock 2GM's left. If your going to spend that kind of money, I'd push you tword a 3 cylinder like the Universal. 3 cylinder engine are smother than 2 cylinder. Pat McCartin Inland Marine Diesel Buford, Ga imd_ga@hotmail.com
 
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qldman36

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Jun 3, 2004
27
Hunter 27_75-84 welaka fl
2 versus 3 cylinder diesel

The 2GM is a tight but doable install.[have one in mine] Have never heard of nor seen a three cylinder in a 27'[not to say there isin't one hidden away somewhere].
 
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