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  #1  
Old 06-21-2007, 04:51 PM
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87 300 Sdl Timing Chain

Hello All. I have removed the timing cover and chain on my sdl and noticed that the pin that the chain tensioner guide is pivoting on is protruding from the block at an angle as opposed to being perpendicular to the block. Is this condition normal? Or has this been bent out of true shape?

Also I have the head off the motor. There is a fitting on the side of the head for the heater hose and it appears to have corroded and was leaking. When I removed it the threads were , needless to say, destroyed. Is the any known repairs for this condition?

Thank you all in advance for your reply

Eddie E.

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  #2  
Old 06-21-2007, 05:18 PM
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Bob
 
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no. that is not normal. Pins should be straight as an arrow and I'm curious how that could happen. Either slid out of it's resting place and got torqued by the chain or bent in the middle (secured on both ends by block and cover) equally by some extraordinary torqued placed on the pin.

As for the heater hose, I'm not aware of any 'threads' but it just is pressed in (by hand) into the head assuming it is the one driver's side towards cylinders 5/6 on the head.
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1982 300TD 210K miles ("The Replacement" aka "The Anvil") - SOLD
1979 300SD 245K miles (never ending project)
2007 Pinarello F3:13
1995 Ducati 916 (SOLD, sniff)
1999 Ducati 900SSie (SOLD)
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  #3  
Old 06-22-2007, 02:19 PM
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87 300 Sdl Timing Chain

I RECENTLY BOUGHT THE CAR, 315K MILES, HAD A BLOWN HEAD GASKET. BUT THE FIRST THING I NOTICED WHEN REMOVING THE HEAD WAS THAT THE TENSIONER WAS SITTING CROOKED IN THE SLOT. THE TIMING COVER SHOWS NO SIGNS OF DAMAGE WHERE THE PIN RESTS. iT APPEARS THE PIN IS BENT FAR ENOUGH TO REST OUTSIDE THE SOCKET IN THE TIMING COVER. ANYBODY KNOW HOW THIS PIN IS FITTED IN THE BLOCK? THREADS OR PRESSED IN? I AM LEARY OF TRYING TO BEND IT BACK AND HAVE IT BREAK OFF OR DAMAGE THE BLOCK.

AS FAR AS THE LEAKY HEAD, YES THE FITTING I AM REFERRING TO IS BETWEEN CYL'S 5 AND SIX ON THE DRIVERS SIDE. BUT, THE FITTING THAT THE HEATER LINE IS PRESSED INTO IS WHAT HAS FAILED AND WILL HAVE TO BE DEALT WITH. I AM CURIOUS IF ANYBODY ELSE HAS SEEN THIS PROBLEM AND ENGINEERED A FIX FOR IT. A HELICOIL MAYBE? CUT THREADS FOR A-N FITTING? HAVE ANOTHER FITTING WELDED TO THE HEAD AND REWORK THE HEATER HOSE?

EDDIE E.
87 300 SDL
(315K AND JUST GETTING STARTED!)
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  #4  
Old 06-22-2007, 02:52 PM
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Blown head gasket? What is the casting number of the head? If it's 603 010 14 20, have the head thoroughly checked for cracks especially in the areas around the #4 and #5 valve seats. If the leaking fitting suggests the engine overheated, consider replacing the head to avoid more work in the future. If the digits in the -14- position are higher than -14- there's a good chance it survived overheating. If you found coolant in #4 or #5, toss the head.

The heater core line/fuel thermostat attachment to the head goes into a fitting (601 203 01 36 with washer N 007603 022100) threaded into the head. It should be a simple matter to replace the fitting. Or are you saying the attachment of the fitting to the head is compromised?

AFAIK the tensioner rail pin doesn't extend to the front cover. Maybe yours is different from the ones I've seen. Did you drop or rest the head on the tensioner rail while removing the head?

Sixto
93 300SD 3.0 - comatose
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  #5  
Old 06-22-2007, 02:53 PM
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Maybe you mean the smaller oil pump chain tensioner pin?

Sixto
93 300SD 3.0 - comatose
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  #6  
Old 06-25-2007, 02:34 PM
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timing and head

The edge of the abyss......

The pin is definately for the timing chain rail and there is a boss in the cover for it. It was bent far enough to rest next to the boss. I have already removed the old pin and found a new replacement.

I have now examined the head and found it to be cracked on cyl's five and six. I spoke with he owner of a machine shop about repairing the head and he said it was possible but would not last very long. I thought it was interesting to note that he said that casting numbers mean nothing as far as the quality of the head. But he would not take this unit as an exchange for reworked ones available on the shelf! Hmmmmmmmmm..............

Anybody know of a source of used or reconditioned heads?

Eddie E.
87 300 SDL looking for more miles!
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  #7  
Old 06-25-2007, 02:56 PM
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New -22- castings are available. They come with seats and guides but not much else. Transfer hardware from your old head. You might need a new valve or two. Check with Phil through the Fastlane or Buy Parts link above. Sometimes you find them on eBay or local ads.

Someone said there are lower priced new castings from Spain. I haven't heard of anyone buying or using such a casting.

You can get another -14- and take a chance. I'm not aware that anyone has found cracking issues with -17- or higher castings so there's a good market for these used heads. You have to watch that you don't get the head off a normally aspirated 603. 17, 20 and 22 are definitely turbo castings, and the most commonly available.

Check the archives for gsxr's comments on fitting a new/er head. You have the choice of trimming your prechambers to fit or getting later style prechambers and injectors. The best deal is probably a used -17- head complete with injectors.

Sixto
93 300SD 3.0 - comatose
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  #8  
Old 06-29-2007, 03:23 PM
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Alternate

Hello all,

Would a head from a 300TD fit on a 603.961 motor?

What about similar heads for 603.960, 603.962, 603.963, 603.971, 603.972 or, 603.950?

Eddie E.

300SDL needs transplant
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  #9  
Old 06-29-2007, 03:44 PM
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Any head off a US spec 603 will fit. .96 and .97 heads use different prechambers and injectors. .96 prechambers can be modified to fit a .97 head. Makes no sense to adapt .97 prechambers to the less reliable older head so I don't know if it's possible. You cannot fit a .96 injector in a .97 prechamber, nor a .97 injector in a .96 prechamber. You should be able to use either pump with either set of injectors.

Never heard of a 603.950 in the US. If that engine doesn't have a turbo, I wouldn't use it in a turbo application. I know nothing about the .962, .963 and .972. There's also a 603.970 in the US = 90-91 350SD/L.

Sixto
87 300D
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  #10  
Old 06-29-2007, 03:45 PM
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Forgot to mention - makes little sense to fit another .96 head if .97 heads are available.

Sixto
87 300D
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  #11  
Old 06-29-2007, 04:09 PM
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Sixto,

Do you know the part number for a .97 head? The only heads I have been able to find have been used #14 castings. There are plenty of heads available on e bay Germany but I assume from your reply above that they don't fit. What year model is the .97 head?

Thanks for sharing

Eddie E.
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  #12  
Old 06-29-2007, 06:24 PM
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The .97 heads in cars sold in the US have casting number 603 010 17 20 where -17- replaces -14-. In later years MBUSA sold casting numbers -20- and -22- and maybe others to replace -17-. I believe from gsxr's analysis that there was a progression of improvements to the oil gallery between the timing chain cavity and #1 cylinder. After the metallurgy improvements from -14- to -17-, that is.

The -17- head came in US 90-91 350SD/L, 92-93 300SD and 94-95 S350.

Sixto
87 300D
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  #13  
Old 06-29-2007, 06:26 PM
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There are lots of serviceable -14- heads available. If a knowledgable machinist inspects and clears a -14- head, that might be the economical option. I expressed personal preference when I suggested you look for a later head.

Sixto
87 300D
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  #14  
Old 07-03-2007, 10:54 AM
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???????????????????????????????????????

I came across something interesting this morning. My brother bought a 87 300sdl last weekend and the part number on the head was 3 016 18 01. Is this a non turbo head? The best part is that after driving it home 200 miles without any problems, the next morning it wants to overheat. Noticed that there is only water in the coolant. hoping it just evaporated and created the overheat.
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  #15  
Old 07-03-2007, 12:16 PM
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I believe -18- is a turbo head. gsxr will know for sure.

The casting number is 603 016 18 01 but the 60 is sometimes shaved off when machining the #2 or #3 injector pocket in replacement heads.

Sixto
87 300D

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