Sunday, 15 March 2015

Refitting the Webers

Last week I received another box containing various parts for my three TR7's. And among these parts there were also two rather vital small bags, which contained a pair of Weber DCOE stud kits. When I wanted to fit the carburettors a few weeks ago, I noticed that several of the original studs were badly worn. So not fit to reuse ...

But I did use them to trial fit the carburettors with the new sealing plates. This showed me that the original studs that came with carburettors were too long. With the ends of the two top studs touching the carburettor body, the seal was still lose between carburettor and manifold flanges. Clearly needed some shorter studs, which among other things I ordered through Demon Tweeks ...

In the picture above the difference in length between the old and new stud is quite clear. Even though the previous sealing plates were slightly thicker, due to the studs being too long it was impossible to tighten them up fully.  And this also for me explains how it was possible for the mounting holes on the carburettors to wear out as they did.
After removing all of the old studs and inserting the new ones (using the proven two-nuts-locked-together-method)  it was time for the carburettors to be fitted. This is a rather straight forward job, except for the fact that for the top nuts there is hardly room for decent spanner access. So rather time consuming to get the top nuts tightened.

The short spanner throw also prevented decent feel as to how tight the nuts were. So to get all nuts torqued down more or less the same I used a set of feeler gauges to measure the gap between the cup washers that retain the rubber grommets.

And to show the problem, the amount of room in front of the top studs. In this case there is about 5 millimetre room between the end of the stud and the carburettor's body. With the old set up is wasn't possible to get a 1 millimetre feeler gauge in the gap.

Now waiting for the last bits to get the car ready for the road. I also ordered new seat belts but clearly something went wrong with the lap straps when they packed them at the factory ...

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