Thread: It's over.

Originally Posted by DoubleChevron

Oh crap ...l'm thinking broken cambelt .... does the valve train move when you crank the motor ? Either that or it dropped a valve if its only 1 cylinder. I know early sodium filled valves could break the end of the valve off.

why does my brain say "fit a 350 chev" .... Endless cheap parts and availability. all alloy LS series is just to powerful and you'll end up breaking everything and driving yourself nuts.

I do love that wheezy little v8 in the ****box here ..... There's no way I'd change it to a diesel (then again I have other cars that don't use a lot of petrol to drive as well).

I get it - but if I wanted a non OEM alloy v8, I have a few Mercedes ones here to choose from - and the irony is there's a 5.6 M117 here that Auto Kugel Gmbh used to swap into RRC's back in the day... But there's the disco 2 v8 here (fresh, but just as gutless as all RR v8's) and there's the OM606.... and geez - it's an arm-twist to not go down this route. It's been in the back of my mind ever since the tdi started to irritate me with the undetectable piston slap noise... now the irony is I think I found that noise... but now I'm probably looking at a rebuild on the tdi - because "what else is unknown" - and it might be 130K on the engine, but ahh..... yeah can't trust it now.

And I have the 200tdi manifold here with the t25 flange and it's a proper twinscroll manifold blah blah blah... It was right about the time to do that instead of a new core on the 300tdi manifold - mostly to help tidy the engine bay and make it more logical and better clearances etc. but I didn't want to bite the bullet just yet - and then this happens and well... what do you do. quick fix is new rocker shaft and a squiz down the bore of #4 to see if it's munted - and then - well it's either head-off or worse.... maybe bottom end as well... then the costs get out of hand for something that really makes sweet f-a power.... and that damn 606 is sitting there staring at me... Even the missus is making suggestions about putting in the 606... and I'm hoping this will be an inexpensive fix - but once I tear into it.... the die will be cast. So I better move it up to the back shed and get it in place to do 'engine out' and this story might take a turn in an unintended direction.

Let's hope it's a minor issue - and I don't need to pull the head off.

Originally Posted by Mercguy

I get it - but if I wanted a non OEM alloy v8, I have a few Mercedes ones here to choose from - and the irony is there's a 5.6 M117 here that Auto Kugel Gmbh used to swap into RRC's back in the day... But there's the disco 2 v8 here (fresh, but just as gutless as all RR v8's) and there's the OM606.... and geez - it's an arm-twist to not go down this route. It's been in the back of my mind ever since the tdi started to irritate me with the undetectable piston slap noise... now the irony is I think I found that noise... but now I'm probably looking at a rebuild on the tdi - because "what else is unknown" - and it might be 130K on the engine, but ahh..... yeah can't trust it now.

And I have the 200tdi manifold here with the t25 flange and it's a proper twinscroll manifold blah blah blah... It was right about the time to do that instead of a new core on the 300tdi manifold - mostly to help tidy the engine bay and make it more logical and better clearances etc. but I didn't want to bite the bullet just yet - and then this happens and well... what do you do. quick fix is new rocker shaft and a squiz down the bore of #4 to see if it's munted - and then - well it's either head-off or worse.... maybe bottom end as well... then the costs get out of hand for something that really makes sweet f-a power.... and that damn 606 is sitting there staring at me... Even the missus is making suggestions about putting in the 606... and I'm hoping this will be an inexpensive fix - but once I tear into it.... the die will be cast. So I better move it up to the back shed and get it in place to do 'engine out' and this story might take a turn in an unintended direction.

Let's hope it's a minor issue - and I don't need to pull the head off.

What do you gain with the 606? it looks to be less powerful, probably heavier. Is it more reliable. Is it stand alone, or do you need an expensive aftermarket controller to run it? The M117 sounds interesting. Isn't it a heavy weight dinosaur ? ( I know nothing about them ). This would be my pick if its reliable. Just go easy on the loud pedal in low range so you don't blow the diffs up.

How hard is it to fit the M117.... I would go this route as you already have it there .... and I'm a bit nuts, I like "different" I really can't see the point messing with a gutless, old diesel when diesel is so much more expensive than petrol ... and probably alway will be (unless you intend to do huge milages ... not towing)

Originally Posted by DoubleChevron

What do you gain with the 606? it looks to be less powerful, probably heavier. Is it more reliable. Is it stand alone, or do you need an expensive aftermarket controller to run it? The M117 sounds interesting. Isn't it a heavy weight dinosaur ? ( I know nothing about them ). This would be my pick if its reliable. Just go easy on the loud pedal in low range so you don't blow the diffs up.

How hard is it to fit the M117.... I would go this route as you already have it there .... and I'm a bit nuts, I like "different" I really can't see the point messing with a gutless, old diesel when diesel is so much more expensive than petrol ... and probably alway will be (unless you intend to do huge milages ... not towing)

the 606 in stock trim is about 140kw from 3L It has a full mechanical IP not an EDC unit as fitted to cars. Also bolts up to R380 with adapter plate easily, or use the 722.6 trans from ML and then adapter plate to LT230 - I have standalone transmission controller, so that wouldn't be an issue.

the 5.6L m117 is all alloy sohc v8, and is 220kW. CIS-E jetronic (mechanical) and a very broad flat torque curve. I had thought about swapping this into the RRC many years ago but the fuel consumption figures for the v8 are only about 17L/100 for the same engine in a G-wagen.
I opted for the om606 for diesel, longevity, power (stock engine good for up to 450bhp no issues) upgrades are literally bolt-on.

My concern about the 606 is reliability of the R380 on a slightly uprated turbo.
but logically - it;s sitting here, it's a small amount of work to make it fit, needs a couple of LR-specific mods (rear sump from om648 and a high mount alternator bracket) and the adapter plate for either the gearbox or transfer case depending on the transmission choice.

I think an automatic might be a nicer thing to live with than the R380 - but I'll need to think abotu that briefly.

right now though, need to make some time for compression test and borescope to see how bad the 300tdi is. if the damage is minimal, I'll fix it and move along. if it's munted or needs more than 2K spend, that 606 will go in.

Originally Posted by Mercguy

......................

My concern about the 606 is reliability of the R380 on a slightly uprated turbo.
but logically - it;s sitting here, it's a small amount of work to make it fit, needs a couple of LR-specific mods (rear sump from om648 and a high mount alternator bracket) and the adapter plate for either the gearbox or transfer case depending on the transmission choice.

I think an automatic might be a nicer thing to live with than the R380 - but I'll need to think abotu that briefly.

.................

There are a few 606 (and other Merc diesel) conversions in the Pirate LR section, with varied results

The site is not as user friendly as it was back in the day of heavily modded RRC's.

Dougal has some useful info on turbos for 606's here:

Disco 1 OM606 Build | Pirate 4x4

cheers, DL