Reply
 
Thread Tools Search this Thread Display Modes
 
Old 12-05-2021, 09:42 AM   #1
Member
 
City: Mallets Bay, Vermont
Vessel Name: Bright Moments
Vessel Model: Island Packet
Join Date: Aug 2021
Posts: 15
Cost to replace a 135 hp Perkins?

Iím looking at a very nice Monk 36 with an engine at 7000 hours. It may be just fine but Iíd like to know worse case. I see there are rebuild kits, also re-manufactured engines as well.
Also, my experiences with old engines ( non diesel) is they donít up and die but wear out, get sloppy and the performance drops accordingly. Your thoughts.
Blues is offline   Reply With Quote
Old 12-05-2021, 10:41 AM   #2
Guru
 
mvweebles's Avatar
 
City: Saint Petersburg
Vessel Name: Weebles
Vessel Model: 1970 Willard 36 Trawler
Join Date: Mar 2019
Posts: 3,160
7000 hours is a a lot, but maybe half life. In auto terms, a car with 100k miles assuming decent maintenance. Guessing main seals will start weeping at some point but only a guess. Not a known weak spot.

As far as full replacement 6.354, TAD diesel in Virginia is a good source, though you will need to remove/replace. Looks like you're in Vermont. Wouldn't be an awful drive if you have a pickup truck. TAD is also a good source for Perkins parts

https://www.tadiesels.com/perkins-63544.html

Good luck

Peter
__________________
M/V Weebles
1970 Willard 36 Sedan Trawler
Current Location: Ensenada MX
mvweebles is offline   Reply With Quote
Old 12-05-2021, 11:56 AM   #3
Valued Technical Contributor
 
DavidM's Avatar
 
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,150
If you ever have to replace the Perkins, and I suspect you never will, consider a remanned Cummins 6BT 210 hp. Newer Monk 36s were built with these.

David
DavidM is offline   Reply With Quote
Old 12-05-2021, 02:00 PM   #4
Member
 
City: Mallets Bay, Vermont
Vessel Name: Bright Moments
Vessel Model: Island Packet
Join Date: Aug 2021
Posts: 15
Thanks for the inputs, so what might life expectations be for a well maintained Perkins?
Blues is offline   Reply With Quote
Old 12-05-2021, 02:29 PM   #5
TF Site Team
 
Comodave's Avatar
 
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 13,784
15 to 20K hours? Depends on how it has been run and maintained.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you arenít one, there is no explanation possible.
Comodave is online now   Reply With Quote
Old 12-05-2021, 02:33 PM   #6
Guru
 
mvweebles's Avatar
 
City: Saint Petersburg
Vessel Name: Weebles
Vessel Model: 1970 Willard 36 Trawler
Join Date: Mar 2019
Posts: 3,160
Quote:
Originally Posted by Blues View Post
Thanks for the inputs, so what might life expectations be for a well maintained Perkins?
These old diesels don't die, they have to be killed. Salt water into exhaust manifold of broken raw water pump overheats without operator noticing.

But for pure refreshing of a worn motor with no other symptoms, I'd be surprised if it needed a rebuild before 12k hours, with 15k more likely. That said, many parts will be replaced along the way as maintenance items. Exhaust elbow replacement a couple times. Exhaust manifold once. All pumps at least once. Injection pump service once. Transmission is more fragile than the engine - may need a rebuild once. Injectors too.

It's a tough call not just on Perkins, but any engine. Very few recreational users wear out an engine. 9 out of 10 replacement engines are for other reasons.

I'd guess you can get a reman engine and gear for around $12k-$15k. Probably $3k to have it professionally installed.

If the boat is clean and engine checks out, very unlikely you will put more than a couple thousand hours. Even that is a stretch. However, as you can tell by your concern, resale will be a problem so you are right to seek a credit as you will give it back when you sell. Even then, getting people to look at a boat with 7000 hours could be hard. Most knowledgeable people on this list would sooner look at an older boat with 7000 hours in good shape than one with 700 hours because low usage is often a sign of neglect.

Peter
__________________
M/V Weebles
1970 Willard 36 Sedan Trawler
Current Location: Ensenada MX
mvweebles is offline   Reply With Quote
Old 12-05-2021, 04:11 PM   #7
Valued Technical Contributor
 
DavidM's Avatar
 
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,150
If you are really concerned about the remaining life of the engine, contact Ski in NC a TF member by a PM. Offer to fly him up to the boat, and bring all of the necessary tools to do a blow by test. If the test and overall look and feel checks out including oil pressure, overheating, cold start, etc., you won't have anything to worry about during your ownership. If you have to sell it within a few years, his test should be meaningful to a sophisticated buyer and you probably will get more in increased resale value than the cost of his work.

David
DavidM is offline   Reply With Quote
Old 12-05-2021, 05:28 PM   #8
Guru
 
High Wire's Avatar
 
City: Cape May, NJ
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,308
The path of least resistance is a quality rebuilt with like kind Perkins. Your not going to put a Cummins in place of the Perkins at twice the cost. Trans, exhaust hose, shaft, mounts, harness, control panel, gauges, and propeller are all somewhat different too. At 7000 hours you have lots of life left on the engine itself. It’s the bolt-on marinization bits that give trouble at higher hours. With a quality rebuild those bits are new or also rebuilt. Not to mention scope growth items “While you’re in there…”
__________________
Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Ft. Pierce, FL
High Wire is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 12:31 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012