I was told that I only need to replace the spring and O-ring on my 87 16V chain tensioner (quite a savings). I think the 16V unit is a bit different from the 8 valve version. Do you gents agree with this statement?

On other quick question. Is there any way to test the crankshaft pulley magnetic sensor to insure it is still functioning?

As always thanks for the insight.

Only change the spring if your engine has new version tensioner, otherwise replace completely.
The front pick-up is for factory hook-up of scope to check timing. Timing isn't adjustable so why worry about function of pick-up.

How do you tell the new version tensioner from an old one????

Here's a good test. If it starts and it runs well, then it's working...(the crank sensor that is)

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Jeff Lawrence
1987 300e
1989 300e
1987 BMW 325

[This message has been edited by jeffsr (edited 07-09-2000).]

[This message has been edited by jeffsr (edited 07-09-2000).]

The later version tensioner has a ratcheting piston that locks up & won't return by itself. If you can push the inner piston back in then you need the new style tensioner. To reset the later style, you must completely disassemble it, pull out the piston & re-insert it into the outer opening.

M.B. Doc thanks for the help. It appears that I do not have the ratchet or later type tensioner as I can push the center piston in. The spring the dealer sold me is slightly smaller in diameter and about a half inch longer. Do you have a part number for the later style unit? Have the earlier units all been superseded by this newer style unit?

The lower chain guide was completely gone. The chain has managed to cut about half way through the lowest chain rail pin and about a third through the its partner. Are these pins removable/replaceable? Or would you leave it be?

And finally. The chain I have requires a peening tool. Do I have an option (ie circlip, fishhead clip or peened end attachment type) or do they make only one style chain for this motor? Can I peen it without a special tool?

As always THANKYOU.

1. replace the whole tensioner. Take it apart and install the body into the block, then the piston, then the spring and cover.

2. Yes, the pins are replaceable. I have done this with mine.

3. You can chock the back of the chain with a hammer and peen the front with a ball peen hammer. You have to press the new link on though. Just use caution and a small socket with some large pliers and it will push on.

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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM

If you can't borrow a peening tool you can easily peen it with two hammers as long as you are carefull. In addition I think there are 2 MBZ peening tools...make sure you get the correct one.