Author Topic: 1966 230SL Engine Rebuild  (Read 3109 times)

Harry

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1966 230SL Engine Rebuild
« on: December 26, 2018, 19:46:35 »
I will probably order the first oversized pistons for this car and get the block bored and honed.  I think that I’ve seen the size it needs to be bored to but I don’t see that now.  Where is this information please?
Also, I didn’t realize that the valve guides apparently also come in oversized?  You don’t simply replace them with new original diameter guides?
Hope everyone had a merry Christmas!
Thanks,
Harry
Harry Bailey
Knoxville, TN
1966 230SL
Automatic

ja17

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Re: 1966 230SL Engine Rebuild
« Reply #1 on: December 26, 2018, 22:30:54 »
The piston and cylinder specs are in the early BBB or the Technical Data Book. Otherwise they are listed in most manuals on these cars. If you have none of these let us know and we can look them up for you. The machine shop doing the work should have the new pistons in their hands before doing the machining. The spec for piston spacing and bore size is stamped into the top of the new pistons. Oversize valve guides are available when the bore in the head is no longer to spec. Here again the machinist doing the work will make a decision on the size of the valve guide depending on his inspection during dis-assembly. A good experienced machinist is critical to success. Be sure to have provide all the correct data and specs, so no one will have to guess.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

Harry

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Re: 1966 230SL Engine Rebuild
« Reply #2 on: December 28, 2018, 16:59:46 »
Thanks Joe.  It looks as though Mercedes may no longer offer the 1st rebuild piston size - only the 2nd rebuild.  (My local dealer is confirming that now.)  Does that sound like your recent experience?  Plus, mine is a three ring piston.  I see many are the four ring piston.  Are these interchangeable?

Harry
Harry Bailey
Knoxville, TN
1966 230SL
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ja17

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Re: 1966 230SL Engine Rebuild
« Reply #3 on: December 29, 2018, 05:00:43 »
As long as the piston pin diameter is the same, the three ring or four ring piston should be interchangeable in sets. There was two different piston pin diameters and connecting rods used, so make sure your new pistons have the same pin diameter or the wrist pin hole in the connecting rod may no be a match. New piston pins will come with the new piston assemblies.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

Harry

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Re: 1966 230SL Engine Rebuild
« Reply #4 on: December 29, 2018, 16:02:32 »
Thanks again Joe!
Harry Bailey
Knoxville, TN
1966 230SL
Automatic

cabrioletturbo

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Re: 1966 230SL Engine Rebuild
« Reply #5 on: December 29, 2018, 23:46:59 »
Harry,

Out of curiosity, what is the price for 6x piston 2nd oversize?
Igor
1965 W113 230SL, Ivory with Black

Harry

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Re: 1966 230SL Engine Rebuild
« Reply #6 on: December 30, 2018, 18:21:46 »
The price is about $300 each. :-\
So - what is the best way to remove the keys (woodruff?) in the horizontal timing gear shaft.  Trying to remove the first one and it is very tight.

Thanks,
Harry
Harry Bailey
Knoxville, TN
1966 230SL
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ja17

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Re: 1966 230SL Engine Rebuild
« Reply #7 on: December 30, 2018, 18:27:17 »
Take a blunt drift and gently tap it at one end. It is circular and it should just rotate out of it's rounded keyway.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

Harry

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Re: 1966 230SL Engine Rebuild
« Reply #8 on: December 30, 2018, 20:11:39 »
Thanks Joe - they both came right out.  Looks like the forward key has a slight offset.
I am taking the block at some point soon to have it bored and honed. I think that I need to completely strip the block before doing that, and there are a bunch of miscellaneous bolts, etc. that I was curious about.
On the drivers side, I see 2 large hex head bolts (almost like freeze out plugs).  I expect that I can leave these installed?
What about the phenolic (?) sleeve that the fuel injection pump installed through?  It isn't apparent how that is removed.
Where the horizontal timing gear was, there is a brass/bronze bushing and a 10mm bolt/washer next to it at about the 10 o'clock position (looks like the washer is actually behind the bushing).  The bushing has a  couple of flats on it but I don't know that I need to remove it?  There is another similar bushing behind it (towards the rear of the engine.)
There's a large bolt on the front of the block that is next to the timing pointer bracket.  It actually goes through a sleeve in the timing chain cavity, with a hole in the sleeve to apparently provide lubrication.  It isn't certain what that is for?
And of course there are the hex head screws for the chain guides.
On the passenger side of the engine, there is the plate, and the cover with the throttle pivot.  Those look easy enough to remove.  But there is also a 22 mm bolt into the block?  Not sure about that.
I can post pictures if that would help.
Thanks very much,
Harry
Harry Bailey
Knoxville, TN
1966 230SL
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mbzse

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Re: 1966 230SL Engine Rebuild
« Reply #9 on: December 30, 2018, 22:08:58 »
Quote from: Harry
.../...there are the hex head screws for the chain guides.../...
Removal of the pins for the chain guides I showed you (and DanC commented)
https://www.sl113.org/forums/index.php?topic=28363.msg205633#msg205633
No hex head screws involved with those.
Yes, you should strip your engine block completely; remove all parts before machining cylinders and top (head) plane.
Also remove Allen grub screws (end plugs) for oil galleries (see pic attached), and clean the galleries out with a gun barrel brush
« Last Edit: January 01, 2019, 17:17:01 by mbzse »
/Hans S

Harry

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Re: 1966 230SL Engine Rebuild
« Reply #10 on: January 02, 2019, 00:44:10 »
Yep - I recall about the chain guide pins.  (Thanks again.)  How many of the oi gallery plugs and where located?

Thanks again,
Harry
Harry Bailey
Knoxville, TN
1966 230SL
Automatic