2.6L, 6 pot rebuild - Defender Source
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  #1  
Old December 12th, 2014, 07:47 AM
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Larry
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2.6L, 6 pot rebuild

After purchasing my 69 SIIA Dormobile this summer I have come to adore the 6 pot motor in it. Its a beautiful motor, amazingly smooth, with a wonderful sound. The major drawback to this motor is the scarcity of parts. So my son and I made a whirl-wind trip through the UK over thanksgiving to collect almost every 6-pot specific spare part that I could. The results (only highlights, not a complete list ):

2x Complete motors, (starter, manifolds, dynamo, water pumps, etc.)both supposedly running when removed and appear to have good compression
2x Good condition exhaust manifolds
1x NOS head and complete set of new springs, NOS rocker arms, NOS rocker shafts and new valves)
1x Used head that is cracked but has like new components (supposedly it was rebuild and then cracked around one of the oil inlet bolts during install so it was removed)
1x newly refurbished water pump
1x SIIA Gearbox (used but good condition)
1x Set of prop-shafts (front and back), will need a bit of cleaning up and new u-joints
1x Complete front brake-set
4x Used carburetors (already have 2 rebuild kits)
Many other smaller bits and pieces.

The plan is to go through and rebuild the motors, gearbox and other components to build a healthy spare parts supply for when I come back to the states in a few years. I will try and post updates and pictures here on my progress for those interested.
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  #2  
Old December 12th, 2014, 08:22 AM
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Bill Adams
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I can only assume people paid you to take this stuff away.
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  #3  
Old December 12th, 2014, 08:42 AM
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Beauty is in the eye of the beholder. But I will say that it all together cost me far less than a 200 TDI.
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  #4  
Old December 12th, 2014, 09:19 AM
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J. Michael McCaig
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I have a friend who has a couple of Rover sedans and a 1970 109 with the six cylinder in them and he loves the motors and keeps them in top tune. I have to admit I like the sound they make when they are running right too.
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  #5  
Old December 12th, 2014, 09:28 AM
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Charles Galpin
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Excellent. Although I do wonder if it's such a lovely motor why you need 2 spares

I love my 2.25. I just flog it and put (lots of) oil in it!
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  #6  
Old December 12th, 2014, 10:19 AM
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Steve Maietta
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Is all the wonder and amazement of this engine available in almost any other inline-6's? Are they basic inline 6 traits? Or is there something to this particular design that gives it the qualities? Things like unique firing order, bearing setup, component balance/dimensions?

I've heard lots to scare me away from this engine.. But smoothness and power are of course good things..

~Steve
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  #7  
Old December 12th, 2014, 10:26 AM
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Quote:
Originally Posted by Landerley View Post
Beauty is in the eye of the beholder. But I will say that it all together cost me far less than a 200 TDI.
I dunno.

A freelander is a lot cheaper than a toyota camry initially...
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  #8  
Old December 12th, 2014, 10:36 AM
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The reason for the two spares is the scarcity of parts. They stopped making parts for this engine over 30 years ago. And they weren't produced in near the numbers as the 4 cyl. Right now you can still find them in the UK in good condition, because many people pulled good-running engines to swap to diesel due to petrol costs.

revtor, the thing that makes these unique is an Inlet Over Exhaust (IOE) configuration of the valves. The exhaust valves are in the block instead of the head and the piston heads are sloped. In theory this created a more hemispherical combustion chamber while keeping the dimensions of the head/engine narrow. The problem that this presents is that it is hard to adjust the valve spacing because you have to remove a hot exhaust manifold and engine block panel to get at them. Therefor most people skipped this maintenance leading to burned valves and other problems. I have worked on a lot of engines including the old Chevy and Ford sixes and this motor is very unique in construction, performance and sound.

------ Follow up post added December 12th, 2014 09:38 AM ------

Quote:
Originally Posted by Z.G View Post
I dunno.

A freelander is a lot cheaper than a toyota camry initially...
For me its really about keeping it original. This rare car has survived +45 years in amazing original condition and I can't bring myself to change that.
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  #9  
Old December 12th, 2014, 11:27 AM
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Click image for larger version

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First motor looks pretty good inside. Pistons are oversized so it looks like it was rebuilt at some point.
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  #10  
Old December 12th, 2014, 12:59 PM
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In case anyone is interested in the peculiarities of the f-heads and the rover 6 in particular.

from the internet:

"Now there is one other F-head engine we need to touch upon, the very curious case of the Rover engine. It’s a perfect example of the British eccentric era, combining creative engineering with certain overly-complex and expensive solutions that had no future in an increasingly pragmatic world.
The legendary Henry Weslake was involved, and the result was remarkable: an F-head with some of the characteristics of the hemi head and none of the disadvantages of the convoluted F-head combustion chamber, which was far from ideal in the RR and Jeep engines. Take a good look at this cut away (source: head2head.free-online.co.uk), it’s both so brilliant yet unnecessarily complex.
The intake valve is overhead, where it can be large. But the exhaust is canted at an odd angle, sticking out the side of the block and necessitating a complex casting and valve train. But the result is close to a hemi/pent-roof cylinder head, and the exhaust port’s pathway is delightfully unencumbered , unlike in the traditional F-head’s tortured ports.
The Rover engine was built from 1948 until the late seventies, and powered such handsome and delightful cars like the Rover P5 (above), the executive and government vehicle of choice, depending on one’s very carefully defined class level, automotive and otherwise. The final Rover 3.o six was eventually replaced by the Buick-derived 3.5 L aluminum V8. Detroit pragmatism triumphs again."
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  #11  
Old December 12th, 2014, 03:20 PM
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ed angel
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Nice to see you keeping the 6 in your truck . I know guys with this motor who love it and just keep it tuned . I have a buddy rebuilding one of these as well , I'll share this thread with him .
I'm subscribed and will be fallowing your build .
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  #12  
Old December 13th, 2014, 09:09 PM
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Keith Armstrong
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Dang that bore spacing looks tight...

Do you really have to remove the manifold to do the exhaust clearances?

I can get to the 2.0 valves with it in place.

I'm with the keep it in there camp
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  #13  
Old December 13th, 2014, 09:12 PM
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Robert Davis
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I have boxes and boxes of new 2.6 I-O-E parts.

The engine design dates back to WWI and is an unreliable maintenance nightmare for a daily driver.
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  #14  
Old December 13th, 2014, 09:40 PM
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Quote:
Originally Posted by Landerley View Post
Beauty is in the eye of the beholder.
I agree. Good for you and what a lovely truck you have!
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  #15  
Old December 15th, 2014, 06:18 PM
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ID:	108717 Pulled the lower rocker cover and things are not looking as good. Noticeable lack of oil, and evidence of moisture. I suspect the moisture got in through the exhaust valves since it has been sitting awhile.

Also noticed this small bit of metal floating around Click image for larger version

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It looks like all of the rockers except one were machined and inserts placed next to the rollers.

Here is the rocker without insert:Click image for larger version

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Here is a rocker with the silver shim/insert next to the roller:Click image for larger version

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The loose metal piece looks like one of the inserts broke off this lifter, notice the gap between the roller and rocker arm: Click image for larger version

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I looked at the other motor and none of the rockers there have the inserts/shims next to the roller. I am curious why this was done. I know this engine has been rebuilt before. But it seems like a lot of work to try and repair rockers. Why not just replace them? They aren't cheap to replace but that looks like a lot of work.
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  #16  
Old December 15th, 2014, 06:32 PM
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Todd Kendrick
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I drove one of these '67 109's a few years ago and was very impressed compared to my 109" 2.25..............I have a buddy here who had one; who knows what he did with it.
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  #17  
Old December 15th, 2014, 08:13 PM
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I loved the 2.6 in my 109, kept up with it and it was fine. Having to pull the wing and down pipe was a pain to do the exhaust valves, but never had any valve problems. Keep the oil up and things in tolerance and it was a fun drive. Good luck and I'll watch your progress. My engine didn't have those shims as far as I recall.
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  #18  
Old December 16th, 2014, 03:56 AM
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The shim/inserts appear to be made of lead or some other soft metal. I wonder if it was a performance mod to reduce friction or wear of the rocker?

On a better note, the water pump looks great, no sign of significant wear and the impeller is pretty clean:
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  #19  
Old December 16th, 2014, 07:37 AM
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Steve Maietta
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The factory rover 2.25 tappets are also lead/soft metal coated on the roller bearing surface, so this must be a standard 1950's era thing.
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  #20  
Old December 16th, 2014, 01:21 PM
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Quote:
Originally Posted by revtor View Post
The factory rover 2.25 tappets are also lead/soft metal coated on the roller bearing surface, so this must be a standard 1950's era thing.
"Lead/soft metal"? Do you mean Babbitt? You know; the stuff they make bearings with.
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