weak synchromesh - Alfa Romeo Forum
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(Post Link) post #1 of 4 Old 14-06-04 Thread Starter
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Join Date: Nov 2002
Location: maidstone, kent
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weak synchromesh

I know this has been discussed a few times on here and some of you other guys have synchs that are "beatable" in a fast change from cold.
Our 155 has had a beatable synch (when cold) since we got it 4 years ago and hasn't shown signs of getting worse.
I figured that as the box got warmer, the viscosity of the oil dropped, therefore a thinner gbox oil would do the trick.
However, I spoke to somone in the know who explained how a synch actually works and they told me they rely on a certain viscosity. I was advised to use older gearbox oil (GL4) as opposed to the more modern (GL5) that was currently in. I had the driveshafts out of the box at the weekend and had to drain the GBox oil to stop it going all over my driveway, so thought I would replace it with some GL4...

result was a MASSIVE improvement. I now cannot beat the synch even from cold.

Worth a try guys...? Marlon, think you said you had the same (slight) problem?


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Re: weak synchromesh

hmmm, wonder if this would help in the 33 - 2nd gear synchro is slightly suspect. cheers for the info.
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Re: weak synchromesh

I'll give it a try Dunc...after I fix the leak
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Re: weak synchromesh

Nice bit of info, ta dunc. Will try that at some point.

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synchromesh , weak

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