[TR] Have I blown a gasket?

Lee&John Howard leejohn7 at gmail.com
Thu May 8 14:09:33 MDT 2014


Thank you Geo and Bud and Phil

I have to ask - how do I do a leak-down test?

The exhaust is definitely white. No droplets there, as far as I can tell.

John


On Thu, May 8, 2014 at 12:39 PM, Bud R <levilevi at comcast.net> wrote:

> Sounds like you've been basically running on two and the occasional 3,
> maybe 4. You didn't mention how it ran before you started your testing.
>
> Sounds like a head gasket  could be blown, but you might have an intake
> manifold leak too that could mess with the carbs, foul the plugs, gum up
> the valves, and affect the compression or all of the above also.
>
> You can always try re- torquing the head and seeing if that helps, but
> since you have to take the rockers off anyhow you might as well do a new
> head gasket if it points to that. What color is the exhaust? Ask whoever
> might have been following you on the run if they noticed any colors from
> your tailpipe?
>
>
> Bud Rolofson
>
> Extreme Parts Racing (more than just a haircut)
>
> 71TR6 CC57365 (Good 6)
> 71 Spitfire MK IV Race Car #3
> 69 Spitfire MK III (back up FE engine/dinghy car)
> 93 Minnie Winnie Race Support Vehicle
> 77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)
>
>
>
>
>
>
>
>
>
>
>
> On May 8, 2014, at 12:53 PM, Lee&John Howard wrote:
>
> Hello list:
>
> Following a club run last weekend, I did some basic testing on the TR4.
> Found that plugs #1 and #2  were fouled, especially #2, which had an oil
> drip on its tip. Proceeded to check the compression : 110 on #1 & 2; 156 on
> #3&4.  Then I remembered something peculiar at the Webers. The front carb ,
> feeding the front cylinders, has for a while not seemed fully effective;
> eg, you can't choke off engine by blocking one or both throats, whereas
> choking either of the rear throats will stall the engine. Finally, I do
> have to top off the radiator more than would seem usual, with no leakage
> apparent.
>
> So - Have I blown the gasket? Or perhaps it wasn't seated properly in the
> first place. I reassembled this engine some 5 years ago, so anything is
> possible. Compression readings four years ago were 135, 130, 130, 135
> (cold) - close enough. The readings above were done on a warm engine and
> were the same wet and dry.
>
> Your thoughts?  And thanks, as always.
>
> John Howard
>
> ** triumphs at autox.team.net **
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