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Rebuild vs Replace


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#1 mcp

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Posted 16 November 2019 - 12:47 PM

I have a marinised Shibaura S753 [Perkins 104-10, Perkins Perama M30, Volvo MD2030, Caterpillar 3003, ford 1220 and there are lots more places this engine has been used].  It is a solid little engine that has found its way into lots of equipment, machinery and tractors, so parts are no problem at reasonable prices or full rebuild kits for that matter.

It has unknown hours or history. It does start easy if glow plugs are heated from cold or if warm no issue at all, no smoke under load either.  But I would just prefer the piece of mind of a semi blank slate on the history of a boat engine.  

 

I am more than capable of removing and installing an engine either existing or new.  I would not rebuild one myself,  that is beyond my skill level. 

 

So what are some pros and cons?  What have been your experiences?  Suggestions?  Recommended mechanics? 

 

I am really struggling to make up my mind. 


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#2 Maté

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Posted 16 November 2019 - 01:23 PM

Rebuilding an engine is not that hard provided you work systematically but it sounds like the motor is sweet. Dont worry about it and just go sailing, you'll find plenty of places to spend that spare coin!


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#3 Luigi Vercotti

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Posted 16 November 2019 - 01:26 PM

I have a marinised Shibaura S753 [Perkins 104-10, Perkins Perama M30, Volvo MD2030, Caterpillar 3003, ford 1220 and there are lots more places this engine has been used]. It is a solid little engine that has found its way into lots of equipment, machinery and tractors, so parts are no problem at reasonable prices or full rebuild kits for that matter.
It has unknown hours or history. It does start easy if glow plugs are heated from cold or if warm no issue at all, no smoke under load either. But I would just prefer the piece of mind of a semi blank slate on the history of a boat engine.

I am more than capable of removing and installing an engine either existing or new. I would not rebuild one myself, that is beyond my skill level.

So what are some pros and cons? What have been your experiences? Suggestions? Recommended mechanics?

I am really struggling to make up my mind.


Starts well and no smoke. Sounds good to me. Maybe get a compression leak down test and oil analysis and if all good, as Maté said, go sailing.
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#4 Fish

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Posted 16 November 2019 - 08:05 PM

In my view, the main problem with marine engines are the ancillary equipment, Water pump, HE,  engine mounts, engine brackets, drive damper plate, exhaust elbow etc.

And can have less reliability (i.e. things failing and constantly fixing things) that are attached to the engine. The engine itself can run fine, doesn't mean you can use it...

 

It can cost almost as much as the engine to replace the gearbox on an old engine, and you are still left with an old engine. 

 

So the answer to the question depends on what your priorities are. If there is a problem with the engine operation now (using oil, big knocks) and everything else is fine, then maybe a re-build. I looked into this, and ended up with a new engine. If you aren't going to do it all yourself, there is still a fair bit of outlay to get it done, and you still have all the old ancillary parts bolted on. If you replace all the ancillary parts, you will spend as much as a new engine...

 

If your current engine has died and you can't afford a new one, then yes, rebuild.

If you just want 'peace of mind', I wouldn't bother, there is no garuntee a rebuild will be any better.

If you want to keep the boat for a long time, or do some epic voyage (i.e. circumnavigate), I'd go for the new engine. but only if you are planning on using it, doesn't sound like you'd recover the cost if you sold the boat.

 

PS, there is a good market for working used marine engines. It is not economic for a lot of boats to put a new engine in, but if their current engine has died, people will take what they can get. If your engine is good, but you want a new one, you can sell yours as a working engine. Sell it before you take it out of the boat, so buyers can see it running and test it etc.


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#5 chariot

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Posted 16 November 2019 - 08:37 PM

Agree with fish. I've been down that track a couple of years ago. Rebuilt still has all the old bits hanging off the side. I went for new for peace of mind. In the end it wasn't a great deal more expensive than a rebuild plus I have a 5 year warranty.


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#6 Elliot749

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Posted 16 November 2019 - 08:48 PM

Hi mcp, I have a complete ( was running) MD2030 on the shelf at work, I am aiming to rebuild it with a kit of pistons/rings/bearings from the UK, it’s about £400 . So I am hoping for around $3000 NZD by the time I’ve added any machine work needed, water pump, etc

 

its destined to replace my 30yo, Volvo 2002, which starts/runs/sounds sweet after thousands of hours use. It just won’t die ! 
 

id love to hear how you get on with the MD2030 rebuild if indeed you do it.  
 

despte hearing endless reports of dud Volvo’s, I really rate my 2002 !


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#7 mcp

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Posted 17 November 2019 - 04:13 PM

The main problem with marine engines are the ancillary equipment, Water pump, HE,  engine mounts, engine brackets, drive damper plate, exhaust elbow etc.

And can have less reliability (i.e. things failing and constantly fixing things) that are attached to the engine. The engine itself can run fine, doesn't mean you can use it...

 

 

 

Most of my Ancillary equipment has already been replaced in the last couple of years, except the raw water pump.  I will install a Perama M30 engine gear driven type in place of my current belt driven unit with home made bracket which gives me the shits every time I look at it. 


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#8 mcp

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Posted 17 November 2019 - 04:15 PM

Hi mcp, I have a complete ( was running) MD2030 on the shelf at work, I am aiming to rebuild it with a kit of pistons/rings/bearings from the UK, it’s about £400 . So I am hoping for around $3000 NZD by the time I’ve added any machine work needed, water pump, etc

 

its destined to replace my 30yo, Volvo 2002, which starts/runs/sounds sweet after thousands of hours use. It just won’t die ! 
 

id love to hear how you get on with the MD2030 rebuild if indeed you do it.  
 

despte hearing endless reports of dud Volvo’s, I really rate my 2002 !

 

I think Volvos get a unfair rap generally.   I tend to agree the spare parts are a bit up there however. 

I will defiantly let you know how I get on with a rebuild and is parts4engines.com in the UK where you are sourcing your rebuild kit from?  


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#9 Frank

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Posted 18 November 2019 - 03:42 AM

Rebuilding an engine is not that hard provided you work systematically but it sounds like the motor is sweet. Dont worry about it and just go sailing, you'll find plenty of places to spend that spare coin!

What he said !  If its reliable , has sufficient power and is a sweet runner, just maintain it well and keep the money, if it aint broke dont fix it. 

 

If you are desperate for a new engine try and get one that, does not involve a propellor change, a bigger shaft dia or shifting the exhaust position. None of these are show stoppers but they can add substantial extra cost, there are probably other avoidance factors.


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#10 Frank

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Posted 18 November 2019 - 03:45 AM

Hi mcp, I have a complete ( was running) MD2030 on the shelf at work, I am aiming to rebuild it with a kit of pistons/rings/bearings from the UK, it’s about £400 . So I am hoping for around $3000 NZD by the time I’ve added any machine work needed, water pump, etc

 

its destined to replace my 30yo, Volvo 2002, which starts/runs/sounds sweet after thousands of hours use. It just won’t die ! 
 

id love to hear how you get on with the MD2030 rebuild if indeed you do it.  
 

despte hearing endless reports of dud Volvo’s, I really rate my 2002 !

Likewise my 40 year old MD7B and its raw water cooled !


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