[Roadsters] Shaking Engine

[Stephen Holst]

Do not forget the choke. the SU's are prone to sticking choke in the down
position (stored cars evaporate gas and the residue is gummy especially with
modern ETOH containing blends)
letting too much gas in when the car warms. This leads to rough idle when
running warm .  
The timing chain seems to me to be very unlikely.  They make a large racket
before they affect the engine's running then it manifest it in surging as
the timing advances and retards due to the slack in the timing chain.
Usually this surging is related to the tensioner rather than the chain it's
self.
As John says try to keep to the basics.
Steve


On 2/19/18, 10:02 PM, "J Sandhoff via Datsun-roadsters"
<datsun-roadsters at autox.team.net> wrote:

> Hi Gerry,
> 
> Like others said... go thru the basics first.
> A shaking engine, ruling out balance issues, can be from a power
> imbalance between cylinders. I'd make sure your mechanic has done the
> basics: besides for basic tuneup and ruling out misfires (a wonky
> distributor - including worn or misgapped points or a bent shaft - can
> play havoc). Check the dwell; if you have access to one put it on an
> ignition 'scope and check spark plug firing voltages; check the
> timing; do a hot compression check. Check the valve clearances. If
> you're still running smog timing (0 degrees) that's a whole 'nother
> discussion.
> 
> Don't totally rule out bad engine mounts. 4 bangers do bounce around a
> bit all on their own, and bad mounts don't help.
> 
> And check the dashpot oil in the carbs. It could be as simple as that.
> 
> -- John
>       John F Sandhoff    jsandhoff at gmail.com    Sacramento, CA
> 
> 
> On Fri, Feb 16, 2018 at 2:32 PM, Lars Tungen via Datsun-roadsters
> <datsun-roadsters at autox.team.net> wrote:
>> My engine shake a lot too. But this is a 1600 push rod...
>> 
>> 
>> 2018-02-16 20:38 GMT+01:00 Gerry Royston via Datsun-roadsters
>> <datsun-roadsters at autox.team.net>:
>>> 
>>> I've had my 2000 Roadster for over a year and the engine has always shaken
>>> a lot when idling.  This is starting to bother me.  My mechanic says it
>>> might need a new timing chain which might be a good idea regardless.  He
>>> tells me it's not related to engine mounts or anything like that.  Just
>>> wanted to check to see if anyone else has had a similar issue before turning
>>> it over to him for an expensive timing chain job.  Thanks for your help.
>>> 
>>> 
>>> Gerry Royston
>>> 
>>> 
>>> 
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>>> 
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>>> 
>>> 
>> 
>> 
>> 
>> --
>> mvh
>> Lars Tungen
>> Abaris Consulting AS
>> tlf: 982 66 880
>> web: http://www.abaris.no/
>> facebook: http://www.facebook.com/abarisconsulting
>> 
>> ________________________________________
>> 
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>> 
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>> 
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