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Old 01-23-2021, 10:09 AM   #1
Ulrik's Avatar
City: Roskilde
Vessel Name: Jessie
Vessel Model: Marine Trawler 34dc
Join Date: Dec 2020
Posts: 1
New owners of a trawler and new member on the forum

Hello everyone,

A few months ago we bought our first trawler, a German-built ‘Marine Trawler 34dc’, built in 1981, sailed in the Netherlands and now sailed to Denmark where our family will sail it out on new adventures.

It is powered by 2 x 6-cylinder Ford Lehman engines, and here in Scandinavia Volvo Penta is the most 'normal' - and therefore we hope to find tips and tricks in the forum to keep these engines reliable in the future, as it is difficult to get help locally here.

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Old 01-23-2021, 11:55 AM   #2
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City: Kitimat, North Coast BC
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Welcome aboard, from Canada’s west coast
"The most interesting path between two points is not a straight line" MurrayM
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Old 01-23-2021, 12:05 PM   #3
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City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 7,503
Welcome aboard TF & congratulations on te "new" boat
2008 MS 34 HT Trawler
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Old 01-23-2021, 12:45 PM   #4
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City: Southport, FL near Panama City
Vessel Name: FROLIC
Vessel Model: Mainship 30 Pilot II since 2015. GB-42 1986-2015. Former Unlimited Tonnage Master
Join Date: Oct 2007
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Congratulations. I owned a pair of those 120 Lehmans, as they are commonly referred to, for a long time, and I think they are great engines for trawlers. They are easily maintained by people with a minimum of mechanical background but a willingness to learn a bit.

I assume you have the Borg-Warner Velvet Drive transmissions too. Check the specs on them, and you may well find their reduction ratios are different and that your props are are pitched one inch or so differently because of that. That's because BW only made one ring gear back in the day, and they added a pinion gear to make the thing turn on the reverse direction for one side. See if the return transmission oil line from the port engine's transmission cooler comes down to dump directly into the top of the tranny while the other one goes into the side. That was done to allow better cooling for the port side with its extra pinion. But I digress....

I still have my Excel spreadsheet I generated for maintenance schedules. If you want it, PM me. All you need do is insert your engine hours and the date at the top of the page plus the last actual date or hours for completion of each line item, and the auto calculations will tell you what is due.

If you have no knowledge of when these things were done, do them now:

Change the injector pump sump oil, if you have the Simms pump (Simms printed on side of it)
Change the coolant and while doing so change the vee-belt and place a second replacement belt inside loop of the hose which had to be removed to put the new one on. Then zip tie the second belt to the hose. Now when/if the belt in use breaks, there is no need to pull the hose, dumping the coolant into the bilge, to replace it.
Remove and test the oil cooler, heat exchanger, and transmission oil cooler while changing the coolant.
Retorque the head bolts. Check the flatness of the valve cover between the eight screw holes with a steel ruler while retorquing the head bolts because people often overtighten them beyond the 22-INCH pounds specified trying to stop small leaks from the joint. Get a new gasket if this is the case and properly torque the screws after carefully pounding flat the dimpled screw holes.
After retorquing the head bolts, check the valve clearances (lash) per the manual. If you do not have the manual, ask me for it in your PM.
Change the oil.
The exhaust elbows are usually good for five years or so. Look for any evidence of rusty water drips on the underside of the elbow falling on the heart exchanger. Time to replace if so. Drain coolant first. Be sure to put anti-seize on the bolts when you replace them.
One of your engines probably has a set of hoses leading over to the water heater. I added a shutoff valve on the engine where each lead off from it in case there was ever a pinhole in the water heater tubes or a broken hose.
If you do not already have the modified expansion tank filler neck with the associated plastic coolant recovery bottle, be sure to contact American Diesel in Kilmarnock, VA for the kits with accompanying instructions. Makes a world of difference in coolant management and potential troubleshooting.
Change the tranny oil.
Strap a Borel exhaust heat alarm or something like it on your exhausts (generator too). Some prefer flow alarms in the seawater circuit, and that's OK instead of or even in addition to the exhaust heat alarm.
If you have Racor primary filters, consider adding the Parker (makers of Racor) water alarms to them - nothing worse for injectors than a slug of water.
The original on-engine, secondary, fuel filters were a pain to deal with, and Parker makes a 1N-CAV kit replacing the originals with a spin-on type filter.

Once you get all these items covered or accounted for, you should be good to go for worry-free cruising, and there are doubtless about a hundred other things rattling around in my brain like never run both engines from the same fuel source.
Rich Gano
FROLIC (2005 MainShip 30 Pilot II)
Panama City area
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Old 01-23-2021, 01:06 PM   #5
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City: Au Gres, MI
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Welcome aboard and congrats on your new boat.
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Old 01-23-2021, 02:02 PM   #6
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Welcome aboard.
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Old 01-23-2021, 04:00 PM   #7
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City: Oconto, WI
Vessel Name: Best Alternative
Vessel Model: 36 Albin Aft Cabin
Join Date: Oct 2012
Posts: 3,052
Those F.L. 120s are great engines and you will love owning them. Maintain them, change the oil, etc and run the heck out of them. They will easily go 10,000 or more hours. I run mine at around 1,700 rpm.

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Old 01-23-2021, 07:04 PM   #8
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City: San Diego
Vessel Model: Helmsman 4304
Join Date: May 2016
Posts: 1,970
The web at its best. A new member introduces themselves and their new boat. A stranger X thousand miles away does a nice write up about their engines and offers their maintenance spreadsheets.
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Old 01-23-2021, 08:21 PM   #9
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City: Ex-Brisbane, (Australia), now Bribie Island, Qld
Vessel Name: Now boatless - sold 6/2018
Vessel Model: Had a Clipper (CHB) 34
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Yes, this is what we do best, folks.
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