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Old 10-14-2010, 08:30 AM   #21
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RE: How Many Ford Lehmans are there?

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RT Firefly wrote:

Make sure you have LOTS of ventilation when using the brake cleaner!!!!
**
Sounds like a tossup whether you die*in the explosion and fire*or from*liver failure later on.* *
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Old 10-14-2010, 09:38 AM   #22
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RE: How Many Ford Lehmans are there?

Hiya,
** Good points Rick B.* Disregard my post.* Be safe!
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Old 10-15-2010, 06:03 PM   #23
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RE: How Many Ford Lehmans are there?

Just had a nice hour long chat with the man himself Bob Smith at the Annapolis show. As always a great guy to talk with. He never wants to stop learning about these engines. To touch on one of the subjects brought up here before by yours truly, he doesn't have any problem with someone running synthetic single weight oil or synthetic ATF. He doesn't see any big gain in his mind for the extra cost however. He insists that the over-sized prop is not the way to go and the engine should be cruised at 1700-1750 rpm for max torque and efficiency. At 2500 hours you really need to check your drive dampener. One trick way to do it is to replace two opposing bolts with longer ones so you can slide the tranny back to inspect the dampener. He's a big fan of the coolant recover kit and the larger tranny and oil cooler lines kit.
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Old 10-15-2010, 08:17 PM   #24
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RE: How Many Ford Lehmans are there?

Good info Daddyo, on our trawler 1700-1750 just "feels right".
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Old 10-15-2010, 09:07 PM   #25
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RE: How Many Ford Lehmans are there?

Forklift, Daddyo,Just feels right is probably just like "sweet spot" and has nothing to do with what's good for the engine but what speed is the smoothest.
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Old 10-18-2010, 06:53 AM   #26
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RE: How Many Ford Lehmans are there?

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ARoss wrote:

My '73 MT has the 120 Lehman, about 4,000 hours, pretty much in "original" cosmetic condition, meaning a whole lot of dirt, oil etc on it. Is there an effective method of cleaning/degreasing/repainting without pulling the entire engine or filling up the bilge section with a nasty mess? *Daddyo's looks like you could eat off of it.

-- Edited by ARoss on Thursday 14th of October 2010 06:06:13 AM
I just went through my notes from the Bob Smith engine class. He told us then to use mineral spirits to clean the outside of the engine.
R,

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Old 10-18-2010, 06:58 AM   #27
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RE: How Many Ford Lehmans are there?

I've been running my Lehman 120 at 1800 rpm. At every fill up, I calculate the fuel consumption per hour. I am getting 2.5 galls/hr and that runs the boat at 7kts (clean bottom).
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Old 10-18-2010, 07:20 AM   #28
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RE: How Many Ford Lehmans are there?

I run at 1700/1800 and get about 6.5 kts. I think I am just under 2 gph near as I can figure and that includes some lightly loaded gen time.
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Old 10-18-2010, 11:02 AM   #29
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RE: How Many Ford Lehmans are there?

ralphyost,Your'e probably burning 3 or maybe even 3.5 gph as there is a lot of engine time on the meter that is not run at cruise throttle * * ....warming up, no wake zones, rough water, fog and many other lower throttle situations that render that method very inaccurate.
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Old 10-18-2010, 12:21 PM   #30
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RE: How Many Ford Lehmans are there?

Willy
Yeah I am probably getting somewhat higher than my calc. especially because I neglected to mention that my genset pulls diesel from it also. I dont bother seperating genset fuel consumption since this summer only used genset for 40 hours or so. Its negligible.

However, I can tell you that the Lehman 120 uses VERY LITTLE fuel at idle speeds.* You can prove it by starting cold then running at idle only and watching the temp gauge. It will hardly warm up at low idle, even at 1000 rpms. Takes forever.
Thats because there is not enough fuel burn in the cylinders to generate the heat required to get the engine up to operating temps.

Bob Smith advocates start up, throw off the lines and leave the dock. Do not wait for warm up. Run at 1500 or so until you see the temp start coming up then move on up to 1800 RMP.

So the actual fuel burn is an actual estimate.

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Old 10-18-2010, 01:23 PM   #31
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RE: How Many Ford Lehmans are there?

Yup * *....ther'e heat engines and w a mixture of 60-1 *40-1 can't make much heat. Gas is about 15-1 ALL the time so gets real warm at even low power. That's the main reason diesels are more efficient and as they near full throttle i'm told they're about the same * *....in efficiency. It takes me at least 10 min of running before I'm up to cruise speed but unlike Bob Smith I like to let the engine run at least 2 min before putting in gear. Seems I frequently disagree whith that guy. This point is fly stuff though.
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Old 10-18-2010, 11:28 PM   #32
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RE: How Many Ford Lehmans are there?

A couple of years ago we siezed one of our Lehman 120 engines, and to this day I don't know how we managed to do it. We left the overnight mooring and headed home, about 30 minutes after starting the motors the port egine warning oil temp buzzer came on, we shut the engine down and came home on the starboard engine.

Our mechanic, the best Lehman man in our part of the world, went over the engine and eventually found the problem. One of the pistions had melted to the top of the cylinder head, the impeller had some damage but was still recognisable as an impeller,water strainers appeared OK, in short we had no idea what caused one of these 'bullet proof'engines to melt in such a short time. Just wondering has anyone ever come across anything similar
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Old 10-19-2010, 05:16 AM   #33
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RE: How Many Ford Lehmans are there?

Hiya,
** Mr. shrimp.* Just out of curiosity was the melted piston the one at the "front" of the engine?* ie: the one furthest from the transmission?
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Old 10-19-2010, 05:33 AM   #34
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RE: How Many Ford Lehmans are there?

I would guess it was #6. Melted?
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Old 10-19-2010, 06:08 AM   #35
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RE: How Many Ford Lehmans are there?

Hiya,
** Can't remember the cylender numbering.* Is #6 at the front?
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Old 10-19-2010, 06:49 AM   #36
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RE: How Many Ford Lehmans are there?

I think you're on the right track, Rufus
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Old 10-19-2010, 07:00 AM   #37
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RE: How Many Ford Lehmans are there?

I was told by several "experienced timers" that #6 is the one that will overheat.
Bob Smith was NOT one of them.

I actually have most of my lines free before I fire up the diesel. I walk aft, verify water out the exahust, climb on the bridge and by then the first mate is freeing that last lines.
So I'm probably running for 1* to*1 1/2 minutes max before I cast off and idle to 1100 rpm and 5 knots *down river. 20 minutes later I am where I can "power up" and do my 6.5-7 knots.
So far no cervical strain injuries from acceleration.*
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Old 10-19-2010, 07:11 AM   #38
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RE: How Many Ford Lehmans are there?

Hiya,
** The reason I'm asking which is cyl #6 is if it is the one on the front of the engine, one of the problems with the 120 Leman is an air pocket accumulates at the upper end of the exhaust manifold and that pocket should be eliminated on* a regular basis by opening the small "petcock" at the upper end of afformentioned manifold and allowing antifreeze to drip out a bit.* This can be hastened by loosening the rad cap on the expansion tank.
** If this air pocket is allowed to remain, the cyl adjacent to it (the one at the front of the engine) will run very hot possibly leading to piston melt.
** How many of you Lehman owners do this bleeding on a daily basis?
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Old 10-19-2010, 07:39 AM   #39
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RE: How Many Ford Lehmans are there?

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nomadwilly wrote:....ther'e heat engines and w a mixture of 60-1 *40-1 can't make much heat.
For all practical purposes there is the same heating value (energy content) per pound of gasoline as there is in diesel fuel.

leaning the mixture produces higher, not lower temperatures. The combustion gas temperature in a diesel engine and a gasoline engine is about the same.

The reason a diesel is more efficient is because it converts more heat to work.* It doesn't blow it out the exhaust so less fuel is required to do the same work.
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Old 10-19-2010, 07:48 AM   #40
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RE: How Many Ford Lehmans are there?

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shrimp wrote:the impeller had some damage but was still recognisable ... we had no idea what caused one of these 'bullet proof'engines to melt in such a short time.
Hmmmmm .... do you think the melted piston wrecked the impeller?

Just a refresher question, what does the impeller do?

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