Thanks Bob. I was wrong about the routing of hoses. The repair company is going
to give me an in line check valve. Per your note, I should be OK.
Price Lindsay
Sent from my iPhone
> On Dec 30, 2015, at 7:58 PM, Bob Spidell <bspidell@comcast.net> wrote:
>
> Price,
>
> I'm having trouble following your description because:
>
> 1) there should not be a 'vacuum hose' going into the stock air filters.
> That is actually a (slight) pressure hose for venting crankcase fumes back
> into the induction system for combustion
>
> 2) there IS a vacuum hose from the brake servo--with a check valve at the
> servo or possibly fitted inline in the hose--and it should never be installed
> anywhere but on the nipple on the intake manifold
>
> 3) if you want to run a vacuum line from the crankcase to the intake manifold
> you need to install a PCV valve inline
>
> Anyway, the only possible way to get fuel in the servo is from the intake
> system downstream of the carburettors; if 2 cylinders were not/mis-firing
> that unburned fuel would end up in the crankcase and oil (and possibly some
> evaporated back into the induction system). So, yes, some fuel could get into
> the servo via the vacuum line on the manifold, but if it was more than a
> trace your engine would likely be flooded out.
>
> I'm not sure what the servo rebuilder was talking about (unless you talked to
> the tech that did the rebuild he could have been blowing smoke). There is no
> 'baffle' in the servo; the large air/vacuum piston has a rubber/leather seal
> around the perimeter, and this can get brittle contributing to poor operation
> of the servo. The typical failure mechanism--the one resulting in brake
> fluid being drawn into the air/vacuum cylinder--is the aging and
> embrittlement of the 'gland seal,' a small, circular rubber seal that seals
> the shaft of the air/vacuum piston; on one side is manifold vacuum and on the
> other is the brake fluid in the servo's 'master' cylinder.
>
> If all your hoses, etc. are connected properly to their proper locations I
> would not worry about getting fuel in the rebuilt servo.
>
> Bob
>
>
>
>> On 12/30/2015 3:07 PM, R. Price Lindsay wrote:
>> Listers -
>>
>> A couple of weeks ago my brakes were acting funny. It turned out that all
>> of the fluid was out of the brake/clutch reservoir. I sent the brake servo
>> into be repaired at the suggestion of the list. I just talked to the
>> rebuilder and he said the baffle in the servo was swollen because of a large
>> amount of fuel present in the booster. He mentioned this is not unusual
>> with TR6â??s. I guess this can cause the servo to fail and draw the brake
>> fluid into the servo.
>>
>> Now that the servo is fixed, I donâ??t want a repeat the problem and am
>> searching for a cause for the presence of fuel. A few months ago I was
>> having a problem with fuel starvation. It turned out to be a pinched fuel
>> line. During my long search I made a number of changes including installing
>> a new distributor cap and wires. Somehow I switched a couple of wires and
>> could not get a spark in cylinders 5 & 6. I found the problem after quite a
>> bit of trying to get the car to run smoothly and driving it for 20 - 30
>> miles. Also, maybe a contributing factor or maybe not, a year or two ago I
>> moved the vacuum hose to the induction manifold because I installed air
>> cleaners without a connection point for the vacuum hose. (Before the fuel
>> starvation issue I reinstalled the original air cleaners and moved the
>> vacuum hose back up to the air rear cleaner.)
>>
>> Now for my question: Could the presence of fuel in the brake booster have
>> been caused when I was not getting spark and not burning fuel in 5 & 6?
>> Could the unspent fuel have been sucked into the servo through the induction
>> manifold a while ago, or through the air cleaners recently?
>>
>> Thank you so much for your collective thoughts.
>>
>> Price Lindsay
>> 67 BJ8
>
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