Dean,
A leak-down compression test will tell you if you have a problem with the
head gasket (before you rip the head off ;)
Kevin V.
Tuscarora, Pa
On Sun, Mar 17, 2013 at 10:44 AM, Dean Hedin <dlh2001@comcast.net> wrote:
> Last year before I buttoned up the Sprite for winter I took it for a usual
> weekly ride.
>
> About 4 miles from home I was waiting to get around a tree service crew.
> As I passed them the car began to stumble an run really rough. It felt
> like
> it was running
> on two cyclinders along with a pinging type of sound.
>
> I limped home and parked the car for winter. I figured that perhaps
> something was wrong
> with my home brewed MSD box. I would deal with it in the Spring.
>
> So today I'm out troubleshooting the thing. I started by making a little
> harness that allows
> me to swap out the MSD box. I figured this is a good thing to have anyway.
> But the MSD box
> was not the issue. In fact spark is not the issue. Plenty of spark on
> every
> cylinder even without
> the msd box.
>
> It seemed like at idle, I could pull cylinders 1 & 2 spark plug boots and
> not see an appreciable
> drop in rpms. So I thought maybe something was wrong with the front SU
> carb.
>
> I opened and drained it's float and removed the bell. I then took canned
> air and reverse blew
> through the main jet to make sure the tube was not clogged.
>
> That was'nt it.
>
> Now I'm worried, so I pull the valve cover to make sure none of the rocker
> adjuster had'nt worked
> loose. No problem there...
>
> So now I'm thinking either valves or head gasket. But the failure was
> sudden. Has to be head gasket.
>
> I Googled "symptoms of blown head gasket between cylinders" and I find
> this...
>
> http://retrorides.proboards.com/index.cgi?board=general&action=display&threa
> d=102462
>
> Which has a link to this video on youtube...
> http://www.youtube.com/watch?feature=player_embedded&v=k1zNcXUq834
>
> Which is almost EXACTLY what my Sprite sounds like right now.
>
> Guess I need to finish up that 12G295 head in a hurry. Ordered all the
> bits.
> Need to get this done
> before the 55th shindig...
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