[Rovernet] A TC Puzzle for you!

Hank & Sally Manwell hdmanwell at alumni.bates.edu
Sat May 21 19:50:32 EDT 2016


Looking forward to seeing you there Jim.  Hope all goes well. 

Hank Manwell


> On May 21, 2016, at 7:36 PM, Jim Pile via Rovernet <rovernet at rovernet.org> wrote:
> 
> The answer to out puzzle has still to be discerned. As a last resort I took the car back to the mechanic, and he couldn't remember what he had done!!! I tweaked the carbs further, made sure there was plenty of play in the choke cables and oil in the dashpots. The revving has greatly improved, but still high (about 2800 rpm). I'm driving the TC up to RoveAmerica, so we'll have something to look into/discuss if there's time. 
> 	The TC and I just got back from a very successful 3-day camping trip (8 hours round trip) in the mountains of Virginia, and the car could not have performed better. Hope I'm not jinxing the trip to Massachusetts by saying so. Look forward to seeing some of the gang there in two weeks.
> 
> 			Jim
> 
> On May 8, 2016, at 1:27 AM, Roger Matheson via Rovernet wrote:
> 
>> Hi Jim,
>> 
>> I wonder whether the throttle spindles are sticking slightly. So when you start the car with a little accelerator the throttles stick slightly open, hence the high revs. with the foot off the pedal and the engine vibration the spindles gradually return to their stops and hence the idle. Alternatively the throttle lever may be incorrectly operating the spindles opening them too much at starting (with the pedal pressing at starting) overcoming the return spring tension. Gradually returning them to correct position with engine vibration. So the test would be to get a person to slowly press and release the accelerator pedal while watching the operation of the lever and the spindles. The throttle level is cut into a special shape so as to provide greater sensitivity with the early movements of the pedal. It can be a fiddle to adjust correctly. Also do the pistons move freely up and down and do they have the same amount / type of dashpot oil.
>> 
>> Also does anyone know the dwell angle for a 2000TC
>> 
>> Cheers Roger in Oz
>> 
>> -----Original Message----- From: Jim Pile via Rovernet
>> Sent: Sunday, May 08, 2016 2:06 PM
>> To: Rovernet
>> Cc: Jim Pile
>> Subject: Re: [Rovernet] A TC Puzzle for you!
>> 
>> Thanks for taking the time to share your thoughts, fellows.
>> The choke cable is very slack, but I will check the jets to see if all is well there. In the end, I may just have to visit the mechanic to discover what witchery he was up to. However I figure out the puzzle, I'll let everybody know. We'll see who is the best TC detective!
>> 
>> Jim
>> 
>> On May 7, 2016, at 3:10 PM, Steve Manwell via Rovernet wrote:
>> 
>>> Hi Jim,
>>> 
>>> The choke cables do two things; they lower the jets to enrich the mixture and they open the throttles a little.  It seems that the mechanic would have made adjustments to the carburetors to lower the jets and/or open the throttles in the absence of connecting the cables.  The part I don't understand (as we emailed about previously) is how the engine could settle down into a good idle after initially starting at high rpm.
>>> 
>>> It seems like adjusting the idle speed screw to open the throttles would cause an increase in engine speed that would not decrease as the engine warmed up; if anything it would be expected to run faster and faster.
>>> 
>>> I wonder if adjusting one of the two jets lower to enrich the mixture would be enough to let the car start (how it does so at 3500 rpm I don't know, unless the throttles were also adjusted somewhat open).  As the car warms up, the mixture should become too rich in that carburetor -- maybe two cylinders running too rich "compensates" for too much throttle opening after it warms up and causes the engine speed to go down?
>>> 
>>> You could take the air cleaner off and compare the position of the two jets to see if they are the same.  Lift each dashpot piston and look at the top of the jet where the needle goes into the center of it.  Also, see if you can see (maybe with flashlight and mirror) if the throttles are nearly closed.
>>> 
>>> Sounds like you and Ben may see each other on I-95 on the way to Fitchburg...
>>> 
>>> Steve
>>> 
>>> On 5/7/2016 10:02 AM, Jim Pile via Rovernet wrote:
>>>> Thanks, Ben.  Good to hear from you. One of these days I'll get over to your area for a visit, but I'm still working and time off comes hard. Next year I retire. Whoopee!!
>>>> I've got another fender myself, but the damaged one can be fixed: Just have to get around to it.
>>>> 
>>>> All the best,
>>>> 
>>>> Jim
>>>> 
>>>> On May 7, 2016, at 9:12 AM, Ben Saunders via Rovernet wrote:
>>>> 
>>>>> Hi Jim,
>>>>> Do you need another fender? If so I have a few for you to pick from.
>>>>> Ben
>>>>> 
>>>>> On 05/07/2016 08:22 AM, Jim Pile via Rovernet wrote:
>>>>>> OK, Roverphiles, I've got an intriguing  puzzle for you:
>>>>>> 
>>>>>> A few months back, my '68 2000TC went into a shop to get engine seals replaced, which involved disconnecting the choke cables. When reassembled, the mechanic - who is familiar with English cars - did not re-connect the cables (a chore which I performed later). Instead, to start the car, he made an adjustment somewhere that kick-started the car at around 3500 rpms! Then, as the car warmed up, the rpm's gradually reduced until it was idling gracefully. I have rebalanced the carbs, but that has had no effect. It still starts screaming, then takes about 4 minutes to settle down. What could this mechanic have done to create this most embarrassing way to start an otherwise smoothly running car?
>>>>>> I would ask him, except I've distanced myself from him since a fender was significantly damaged while the car was in his care!
>>>>>> I'll be at RoveAmerica with the TC in a month, so I would like to figure out this puzzle before then.
>>>>>> 
>>>>>> Thanks for your interest.
>>>>>> 
>>>>>> 
>>>>>> Jim Pile
>>>>>> -------------- next part --------------
>>>>>> An HTML attachment was scrubbed...
>>>>>> URL: <http://rovernet.org/pipermail/rovernet_rovernet.org/attachments/20160507/27392557/attachment.html>
>>>>>> _______________________________________________
>>>>>> Rovernet mailing list
>>>>>> Rovernet at rovernet.org
>>>>>> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org
>>>>>> 
>>>>>> 
>>>>> 
>>>>> _______________________________________________
>>>>> Rovernet mailing list
>>>>> Rovernet at rovernet.org
>>>>> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org
>>>> 
>>>> _______________________________________________
>>>> Rovernet mailing list
>>>> Rovernet at rovernet.org
>>>> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org
>>>> 
>>> 
>>> -------------- next part --------------
>>> An HTML attachment was scrubbed...
>>> URL: <http://rovernet.org/pipermail/rovernet_rovernet.org/attachments/20160507/d61f9ca4/attachment.html>
>>> _______________________________________________
>>> Rovernet mailing list
>>> Rovernet at rovernet.org
>>> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org
>> 
>> 
>> _______________________________________________
>> Rovernet mailing list
>> Rovernet at rovernet.org
>> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org 
>> 
>> _______________________________________________
>> Rovernet mailing list
>> Rovernet at rovernet.org
>> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org
> 
> 
> _______________________________________________
> Rovernet mailing list
> Rovernet at rovernet.org
> http://rovernet.org/mailman/listinfo/rovernet_rovernet.org





More information about the Rovernet mailing list