I'm replacing the timing belt on a 1992 240 (B230F). I got my hands on that special counterhold tool (#5204). I have lined up the alignment marks on the crankshaft (matched 0 with that groove on the pulley) and aligned the crankshaft pulley white dot with the groove/dot on the timing cover - real easy. The problem is the counterhold tool doesn't line up with the tensioner stud & nut while the bottom half of that tool should line up with the predrilled oblong holes in the crankshaft pulley. Or if you use the tool on the crank oblong holes, the top of the tool is about two-inches to the right of the tensioner stud. What gives? This car runs beautifully, no stumbling at all ever...
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240 Timing Belt "problem"
Started by Svenska, Mar 12 2011 11:29 PM
5 replies to this topic
#1
Svenska
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Posted 12 March 2011 - 11:29 PM
#2
FCP Groton
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Posted 13 March 2011 - 03:39 AM
Sounds like either someone did not put the crank pulley back on straight or the rubber inside of the pulley is bad and it has shifted some. I would use the hold tool and pop the nut loose then, while leaving the pulley on, line up the marks and then remove the pulley the rest of the way. Take a closer look at the pulley when it is off to see if it needs to be replaced.
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#3 Guest_svenska_*
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Posted 14 March 2011 - 02:16 AM
FCP Groton, on 13 March 2011 - 03:39 AM, said:
Sounds like either someone did not put the crank pulley back on straight or the rubber inside of the pulley is bad and it has shifted some. I would use the hold tool and pop the nut loose then, while leaving the pulley on, line up the marks and then remove the pulley the rest of the way. Take a closer look at the pulley when it is off to see if it needs to be replaced.
It is most likely the pulley has stretched. This is annoying. It's not enough to have the right tool, even with the right tool you still can't use it because the pulley "stretched".
How are you supposed to counterhold the crankshaft pulley then to remove it?
#4
Three Fat Tigers
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Posted 15 March 2011 - 06:17 AM
Use the counter hold to remove/install the pulley, there should be no reason why you cant do this even if the pulley has twisted.
Ignore the timing mark on the rim of the pulley and use the notch in the crank shaft gear outboard guide washer, or the center of the crankshaft keyway. Line this notch up with the release mark on the front seal carrier, as seen in the images below:
Additional timing mark reference found here:
http://www.threefatt...TimingMarks.htm
You can check the pulley during disassembly, loosen the crank bolt, then line up the pulley to the 0º mark on the timing belt cover, then remove the pulley without moving the crank, then inspect the timing marks as above to veriry if your crank pulley is twisted out of time. Though more difficult, you can also do this with the lower timing cover and pulley in place by looking down inside the lower cover with a mirror. It's a good idea to always do this and never rely on the pulley timing mark.
Ignore the timing mark on the rim of the pulley and use the notch in the crank shaft gear outboard guide washer, or the center of the crankshaft keyway. Line this notch up with the release mark on the front seal carrier, as seen in the images below:
Additional timing mark reference found here:
http://www.threefatt...TimingMarks.htm
You can check the pulley during disassembly, loosen the crank bolt, then line up the pulley to the 0º mark on the timing belt cover, then remove the pulley without moving the crank, then inspect the timing marks as above to veriry if your crank pulley is twisted out of time. Though more difficult, you can also do this with the lower timing cover and pulley in place by looking down inside the lower cover with a mirror. It's a good idea to always do this and never rely on the pulley timing mark.
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Posted 27 September 2011 - 02:52 PM
The Bentley manual mentions lining up the "guide pin" when putting the crankshaft pulley back on. After replacing the timing belt, my son, over the phone, told me there was no pin on his 1990 240, and was sure nothing fell off when he took the pulley off (he used IPD's tool to lock the pulley to remove/install the crankshaft bolt). All I can find is what looks like a dog tooth on the crankshaft timing belt gear (below the "B" in the image below). He went ahead and put the pulley back on and it runs fine, as does the alternator/AC/Power steering pump. Is there a separate "pin"? Is the dog tooth the pin? Or, because the later 240's can't have their timing adjusted, is it not needed? Thanks -
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Posted 28 September 2011 - 12:05 AM
This question got resolved. The "nib" (or whatever) was so small my son hadn't noticed it on re-assembly. He did notice this AM his pulley was "wobbling". He took it off; aligned the pulley with the "guide nib"; and, it's now running as only a well maintained 240 can.
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