andyborris
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Freedom is just another word for nothing left to lose.
Posts: 2,158
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Aug 16, 2014 17:42:37 GMT
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Engine has developed a rattle on tick over.
It's a BMW 323I M52 engine, it's in a Triumph however. A M20 lighted flywheel has been fitted and a new Sachs clutch set fitted at the same time.
Starts and drives fine, although the starter has always been “screechy!”, which I put down to the lighter flywheel.
However the engine has now grown a deep toned rattle at tick over, which goes away when revved or even while driving at very low engine speeds. Only rattles when ticking over in neutral.
I think the rattle has got louder over the past few months, don't drive the car as much as I'd like, so it's hard for me to tell if it's getting worse!
Seems to be coming from the crank area....any guesses?
A fellow RR'er gave me a number of someone selling a M52 2.8 engine, guess I really must get my finger out and ring him!
Thanks
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Aug 16, 2014 17:48:57 GMT
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Did you fit an m20 clutch plate or an m50 clutch? Single mass flywheel and unsprung clutch will rattle
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,158
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Matching M20 clutch, wondering if a spring in the clutch has failed?
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rodney
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Aug 17, 2014 11:39:49 GMT
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does it go when you dip the clutch? , thrust bearing,.
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facebook: rodney dean / rd transport
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,158
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Aug 17, 2014 18:14:34 GMT
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does it go when you dip the clutch? , thrust bearing,. Thanks didn't think of this, will check!
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
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Aug 18, 2014 17:38:29 GMT
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Unfortunately, not the thrust bearing.
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Aug 18, 2014 19:06:39 GMT
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Timing chain?
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bstardchild
Club Retro Rides Member
Posts: 14,886
Club RR Member Number: 71
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BMW Engine Rattlebstardchild
@bstardchild
Club Retro Rides Member 71
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Aug 18, 2014 21:48:20 GMT
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Is it a vanos equiped engine?
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Aug 18, 2014 22:16:25 GMT
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Wasn't the M52 the Nikasil lined Single Vanos, until 99ish, when they updated it to Dual Vanos?
I believe these cause quite a problem, they can be removed, and they can be repaired. No idea on the symptoms though, never trusted anything passed 99 yet...
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bstardchild
Club Retro Rides Member
Posts: 14,886
Club RR Member Number: 71
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BMW Engine Rattlebstardchild
@bstardchild
Club Retro Rides Member 71
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Aug 18, 2014 22:30:44 GMT
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Wasn't the M52 the Nikasil lined Single Vanos, until 99ish, when they updated it to Dual Vanos? I believe these cause quite a problem, they can be removed, and they can be repaired. No idea on the symptoms though, never trusted anything passed 99 yet... My M62 Vanos rattles on start up - used to rattle at tickover till I changed the oil a few times in short succession, now it only rattles if I haven't used the car for a few months and then only for 30 secs or until you blip the throttle and then it shuts up and stays quiet
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,158
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Aug 19, 2014 16:06:27 GMT
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Don't think it's the Vanos, plenty of faulty Vanos sound bites on the web, none sound like my engine. And you can feel the Vanos working under hard acceleration.
The car isn't used much, I must admit, but the oil is still gold and it's had regular changes since the engine was installed....perhaps a detergent oil could help?
It really does sound like a thrust bearing, but doesn't stop when the pedals pushed down.
Planning to drive to Barcelona in a few weeks, guess I'll find out one way or another!
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rodney
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Aug 19, 2014 22:46:31 GMT
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does it go when you rev it and come back at idle?? , check crank pulley as these cause these symptoms when the insulating rubbebreaks down , modern diesels often suffer with I , some petrols too,.
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facebook: rodney dean / rd transport
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bstardchild
Club Retro Rides Member
Posts: 14,886
Club RR Member Number: 71
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BMW Engine Rattlebstardchild
@bstardchild
Club Retro Rides Member 71
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Aug 19, 2014 22:50:58 GMT
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does it go when you rev it and come back at idle?? , check crank pulley as these cause these symptoms when the insulating rubbebreaks down , modern diesels often suffer with I , some petrols too,. That's a nice of the wall suggestion - clever logic too and definately worth a check as there aren't many modern engines that don't have a harmonic balancer built into the front pulley
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rodney
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ive had it on a few diesels , horrible noise , often causes the alternater belt tensioner to bounce about too ,.
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Last Edit: Aug 20, 2014 0:37:30 GMT by rodney
facebook: rodney dean / rd transport
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
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Aug 20, 2014 17:28:42 GMT
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Thanks for the suggestions, did check the crank pulley, but it seemed fine!
I'll replace the pulley and report back.
I had to cut the power steering section of the crankshaft pulley off, it wouldn't fit behind radiator otherwise, wonder if that's caused a problem and this fault (if it is the crank pulley!) will keep coming back?
Think I may get the pulley turned shorter in a lathe this time, rather then attack it with the grinder!
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Aug 24, 2014 15:31:54 GMT
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M52 should have an all metal pulley, no rubber element to them.
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andyborris
Posted a lot
Freedom is just another word for nothing left to lose.
Posts: 2,158
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Aug 26, 2014 19:11:44 GMT
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M52 should have an all metal pulley, no rubber element to them. The late M52 engine in my car has a "rubber", it looks very different to the earlier engines. The crankshaft sensor is also in a different position, by the flywheel. The new pulley, turned up today. Anyone know if the old pulley (assuming it's the problem!) will make the noise if I run the engine (for only a few seconds!) without the fan belt? Thanks
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Last Edit: Aug 26, 2014 19:12:19 GMT by andyborris
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bstardchild
Club Retro Rides Member
Posts: 14,886
Club RR Member Number: 71
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BMW Engine Rattlebstardchild
@bstardchild
Club Retro Rides Member 71
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Aug 26, 2014 20:49:07 GMT
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If its a buggered damper on the original I would have thought it would make a noise regardless of belts on or off, run the old one without belts first to make sure
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rodney
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Aug 26, 2014 21:05:45 GMT
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most don't make a noise with he belt off,.
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facebook: rodney dean / rd transport
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M52 should have an all metal pulley, no rubber element to them. The late M52 engine in my car has a "rubber", it looks very different to the earlier engines. The crankshaft sensor is also in a different position, by the flywheel. The new pulley, turned up today. Anyone know if the old pulley (assuming it's the problem!) will make the noise if I run the engine (for only a few seconds!) without the fan belt? Thanks Assumed early version; not many people do a conversion using the TU model. There will be no tension on the pulley so it would be unlikely to make any noise.
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