> From: Karl Vacek [mailto:KVacek@Ameritech.net]
> Sent: January 11, 2000 11:19 AM
>
> Well, technically you're right - the threads ARE different.
> However, the TR's (up till later 6'd which AFAIK used metric
> threaded brake hoses) used 1/8 British Straight Pipe (BSP)
> with a thread count of 28 threads per inch (TPI), while the
> 1/8 National Pipe Tapered (NPT) threads on a grease gun are
> 27 TPI.
Although I didn't know TR6 brake lines used BSP threads, I'll take your word
for it. Yes, the 1/8-28 BSP is similar to 1/8-27 NPT. The plug on the TR6
steering rack (the one which you're supposed to remove to grease the rack)
is also 1/8-28 BSP. As is the stock Smiths oil pressure gauge. Which leads
me to my point...
The adapter in the engine block to which the oil pressure line attaches is
1/8-28 BSP on the line side and 1/8-27 NPT on the block side (both male on
the dual carb cars, FI cars are different I think). That piece could be used
as an adapter between the grease gun and brake hose for Karl's technique by
anyone concerned with cross-threading brake parts. If you have a spare that
is. Only reason I mention this is because BSP threaded fittings are very
uncommon in North America.
FWIW, on my car the pistons popped out with the aid of a bicycle pump over
the end of the steel line on the caliper. I made sure to wrap the caliper in
a cloth before pumping it up.
FWIW2, the metric fittings on later TR6s Karl refers to were only in the
calipers themselves. All the flexible hoses are the same regardless of year
for a TR6. Any catalog from the major vendors should confirm this.
Peter Zaborski CF58310UO
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