are yanmar 6lp engines rebuildable

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mickyspec

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hello folks
i wonder if someone could confirm or refute if the toyota
1hdfte 4.2 24v base that the 6lp yanmars and the yamaha / nanni engines are based on are rebuildable?
I have heard of different opinions some of which claiming that they were throw away.
thanks in avance
mike d
 
Apparently the older 6lp (toyota base) with mechanical injection is rebuildable.

The newer electronic injected, BY series (BMW based) is a 'parent block', with no over sized pistons or under-sized bearings etc.. available.
 
mickyspec said:
hello folks
i wonder if someone could confirm or refute if the toyota
1hdfte 4.2 24v base that the 6lp yanmars and the yamaha / nanni engines are based on are rebuildable?
I have heard of different opinions some of which claiming that they were throw away.
thanks in avance
mike d
Click to expand...

6 LP is a really nice motor but how deep are your pockets??

My simple answer to this is 'perfectly feaseable but not practical'

The term throw away engine in commonly used today, in the case of the Toyota base motor it is technically re-buildable with components available, but there it ends; Toyota automotive cannot help you, Toyota Industrial (fork lift) dealers could, IF they are inclined, or Yanmar marine dealers. Just a word of warning before you commence the exercise, run the numbers. For example I know what a set of LP pistons DID cost from Mack Boring (Yanmar Marine) in the U.S, was $2,500 at dealer nett. Gasket set...ouch!

Four valve head is an object of beauty, Do not screw with it WITHOUT the correct Toyota Shop Manual.

Many people have trod this path before you and engines ended up RIP (Rusted In Pieces). Just look on Britsh MOD and US CG disposal websites.
 
Latestarter1 said:
6 LP is a really nice motor but how deep are your pockets??

My simple answer to this is 'perfectly feaseable but not practical'

The term throw away engine in commonly used today, in the case of the Toyota base motor it is technically re-buildable with components available, but there it ends; Toyota automotive cannot help you, Toyota Industrial (fork lift) dealers could, IF they are inclined, or Yanmar marine dealers. Just a word of warning before you commence the exercise, run the numbers. For example I know what a set of LP pistons DID cost from Mack Boring (Yanmar Marine) in the U.S, was $2,500 at dealer nett. Gasket set...ouch!



Many people have trod this path before you and engines ended up RIP (Rusted In Pieces). Just look on Britsh MOD and US CG disposal websites.
Click to expand...


Four valve head is an object of beauty, Do not screw with it WITHOUT the correct Toyota Shop Manual.

I wonder if the block can be sleeved
and are the toyota landcruiser 4.2 24valve pistons compatible?
also head gasket etc ???
I know how eye wateringly expensive these parts are try £4200+vat
for a yamaha me432 315hp turbo
 
What a joke! While we are recycling our tins the engineering and electronics industries are extending the throw away culture. Where is the government legislation to stop this happening. I'm no tree hugger but I do hate waste, especially on this scale.
 
IF you really want to take your time to run the ##s be my guest. Search on suppliers of Toyota 1HD-FT Industrial engine parts.

These engines rarely wear out in marine applications, therefore even if you manage to repair the motor the original cause of the failure may still exist.

Finally the importance of the correct antifreeze for these motors is sometimes overlooked, use incorrect formula and you will be into £5K in the hole.
 
You KNOW I have a blind side to the F word, I can see my skin turning green and the clothing tightening around my flabby biceps right now.......

6LP is a sparkling little powerhouse, slightly blunted in current versions by being retarded to make Tier II compliant.

Yanmar stood up and supported the engine though the valve drop issue with a little arm twisting by the Courts. However the truth is that over a long production run motor has done a sterling job. Owners who have them generally love them. Abuse them by penny pinching on service and they will bite you in the pocket.

I will give you a good example is the starter, is a fortune! Dealer has to have one on the shelf as minimum parts holding, will you ever sell one as a dealer, no more likely to be struck by lightning. Stock turns on starter over ten year period with local population of near 250 engines......... zero.

People will however use them in incorrect applications. A few years ago at Seawork I saw a pair in a fast commercial angling boat completely against Yanmar rating guidelines. Expect they have gasped their last or about to, perhaps builder is now bust. Guy trying to run angling business now unable to earn a living, will he have a good word for the motors, I doubt it.

Prop the LP easy, run it as per the book and there is little to beat it.
 
Latestarter1 said:
You KNOW I have a blind side to the F word, I can see my skin turning green and the clothing tightening around my flabby biceps right now.......

6LP is a sparkling little powerhouse, slightly blunted in current versions by being retarded to make Tier II compliant.

Yanmar stood up and supported the engine though the valve drop issue with a little arm twisting by the Courts. However the truth is that over a long production run motor has done a sterling job. Owners who have them generally love them. Abuse them by penny pinching on service and they will bite you in the pocket.

I will give you a good example is the starter, is a fortune! Dealer has to have one on the shelf as minimum parts holding, will you ever sell one as a dealer, no more likely to be struck by lightning. Stock turns on starter over ten year period with local population of near 250 engines......... zero.

People will however use them in incorrect applications. A few years ago at Seawork I saw a pair in a fast commercial angling boat completely against Yanmar rating guidelines. Expect they have gasped their last or about to, perhaps builder is now bust. Guy trying to run angling business now unable to earn a living, will he have a good word for the motors, I doubt it.

Prop the LP easy, run it as per the book and there is little to beat it.
Click to expand...



The engine i am currently prepping is a yamaha me 432 sti 315hp with hydradrive leg . these engines obviously share the same toyota base as the nanni/.however i recall someone on a rib forum saying he rebuilt his 2 valve
per cylinder toyota based yamaha with success.
oh and by the way these yamaha engines also fail prematurely when over propped just like the 6lp and also need the correct coolant ie the weird coloured texaco havoline longlife stuff.
whats also peculiar is that here in europe the early 6lp valve failures seem not to have been covered by the recall as per the yanmar class action that
happened in the USA where the valve modification was done FOC and a susequent warranty provided up to 5000hrs
 
Latestarter1 said:
People will however use them in incorrect applications. A few years ago at Seawork I saw a pair in a fast commercial angling boat completely against Yanmar rating guidelines. Expect they have gasped their last or about to, perhaps builder is now bust. Guy trying to run angling business now unable to earn a living, will he have a good word for the motors, I doubt it.

Prop the LP easy, run it as per the book and there is little to beat it.
Click to expand...


Just to expand a bit on a previous engine thread you commented on about inferior installation methods by some boat manufacturers LS.

A boat (Aussie built) was bought by one of our locals with a couple of 6lp Yanmars, that had snapped the crankshaft on the stb. engine twice at just over 100 engine hours each time. The last time he was left floundering in heavy seas, 40 miles out, for nearly 36 hours waiting for a tow, but thats another story...
The owner, heard from the manufacturer (he had a used boat with no warranty) that the engines where essentially weak, and this problem had occurred before, they had learned their lesson and would never install them in their vessels again.

To keep the engines matched the owner bought another new Yanmar (?), and during the installation by our local engineers, it was discovered the manufacturer hadn't provided suitable engine bed/bearers to support the motors adequately. Strengthening work was carried out to both engine bays, and things have been fine for a couple of years, and plenty of hours.
 
Last edited:
mickyspec said:
whats also peculiar is that here in europe the early 6lp valve failures seem not to have been covered by the recall as per the yanmar class action that
happened in the USA where the valve modification was done FOC and a susequent warranty provided up to 5000hrs
Click to expand...

You are absolutely correct. I gave details of 6LP Class Action Lawsuit here twice in order that owners could check if their engine # in the series. The result was just one owner contacting me for the full details, I have done my bit.

European distributors have clearly kept their heads below the parapet, perhaps oppotunity to sell more motors in a year or so is more important than supporting their customer base. Death rattle tap tap genearlly starts around 900 hrs when pulling back the throttle.

I expect somebody will start to scream before the end of the season..
 
Latestarter1 said:
You are absolutely correct. I gave details of 6LP Class Action Lawsuit here twice in order that owners could check if their engine # in the series. The result was just one owner contacting me for the full details, I have done my bit.

European distributors have clearly kept their heads below the parapet, perhaps oppotunity to sell more motors in a year or so is more important than supporting their customer base. Death rattle tap tap genearlly starts around 900 hrs when pulling back the throttle.

I expect somebody will start to scream before the end of the season..
Click to expand...

I believe I was the 'one owner' who contacted you and my engines were within the affected number range.
My engines were relatively low hours of 270 'ish when I bought the boat...Sealine S41 and I was aware of the potential long term issues with these engines but to be honest I wasn't expecting to keep them till 900 hours when the death rattle was meant to start.
I did end up with the so called death rattle at about 330 hours which happened just after a major service, it was only on 2 or 3 occasions after one really long run. After that silence mercifully!
I've since sold the boat to a very happy 'new owner' who now cruises on the Thames where the lack of smoke and completely smooth transition in and out of gear where the reasons for choosing my boat/engine combo.

Great engines though that had instant starting even after months of lay up but juicy and parts are as you say eyewateringly expensive.
 
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