PA28 technical question
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PA28 technical question
Hi all,
Can anyone tell me if theres a reason that the primer on the Cherokee only primes 3 cylinders and not all 4???
Short and sweet, any help appreciated
Thanks
Can anyone tell me if theres a reason that the primer on the Cherokee only primes 3 cylinders and not all 4???
Short and sweet, any help appreciated
Thanks
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Thanks
Thanks very much for your help, fullyfine.
If there is anyone who knows for definite what the reason is, or can confirm fullyfine is correct, I would be grateful to hear from you.
Thanks all
If there is anyone who knows for definite what the reason is, or can confirm fullyfine is correct, I would be grateful to hear from you.
Thanks all
Join Date: Mar 2001
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It's happened to me again!! I posted an answer to this some time ago - it hasn't made it to the screen.
However - my answer was the same as fully fine - it helps start on the "dry" cylinder when Gromit jumps in and overprimes it.
However - my answer was the same as fully fine - it helps start on the "dry" cylinder when Gromit jumps in and overprimes it.
Join Date: Jan 2000
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The Fourth cylinder conection is used for connecting the manifold pressure gauge on engines with constant speed props.
Always #4 cyclinder (stbd aft cylinder)
Regards
Always #4 cyclinder (stbd aft cylinder)
Regards
But make sure it is actually locked on the pre take off checks. A pilot in my club once commented that the engine rough ran at low RPM and wouldn't shut down on ICO on one of the club PA28s, so he shut down on the mags. On inspection, it turned out to be the primer which was unlocked and slightly out, by only about half an inch.
It was obviously allowing fuel to be sucked past it into the cylinders making the mixture rich and causing the rough running at low RPM. It was also allowing enough fuel to run the engine at ICO.
It was obviously allowing fuel to be sucked past it into the cylinders making the mixture rich and causing the rough running at low RPM. It was also allowing enough fuel to run the engine at ICO.
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Never knew that ..... been instructing on PA38's for years ... whooops !
BTW : I always demonstrate to my students what happens to the engine if the primer is unlocked - and not to 'ram' it back in if they find it out ......
BTW : I always demonstrate to my students what happens to the engine if the primer is unlocked - and not to 'ram' it back in if they find it out ......
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Primers
The primer on the Cessna 152 routes to the front two cylinders only, presumably this is so that when the even worse pre-solo students flood the thing it will start too! One other thing, the copper primer pipes can become work hardened and shear at the connection to the cylinder - check it on the DI, as pilot may end up pumping fuel on to an engine and as it starts and heats up = fire! I speaketh from experience.
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Sorry fellas, it's because there is an optional line for a cylinder head temp gauge that can be installed and connected to that #cylinder. (According to FlightSafety Academy Vero Beach) I think it's right, they're located next door to the Piper Plant!!