Brian :
Sorry to say this, but IMO you have busted rings (maybe even a busted
piston) in #6. Which probably means the cylinder walls are shot, too.
The pressure test is a good idea, as there is a slight possibility it is
just a very badly burnt valve.
Driving it without #6 probably won't hurt anything (assuming there
aren't pieces of ring/piston in the oil), but the burnt valve in #1
might possibly ruin the seat (if it hasn't already). If you are
planning on hardened seats anyway, it doesn't matter.
Randall
Brian Borgstede wrote:
>
> Well,
> I pulled the plugs to see why the 250 had a miss.
> I hoped to see the first three plugs to be one color
> and the last three to be another. Not so lucky.
> The first five plugs where a nice tan color, the
> #6 plug covered in oil. Well, maybe the plug
> fouled and quit firing and built up oil over time.
>
> The compression test...
> cold engine dry
> 90 150 170 140 160 and #6... Zero!
>
> Wet (few squirts of oil in spark plug holes)
> 92 180 195 170 195 and #6... 7psi.
>
> I figure that #1 has a leaky valve,
> I took the valve cover off to check #6 to see if the
> valves where closing. The stems are going up and down
> as normal.
> My next step is to pump compressed air into the #6 hole
> and find it's escape, (water, oil, intake, gasket, or exhaust)
>
> My plan was to drive the car for teh summer and start the
> restoration this winter. I know that the head Has to come off,
> and the rings are worn.
>
> Could I be missing something here?
> Can I just drive it for the summer?
> What kind of leak causes zero to 7psi. compression?
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> NEW E-MAIL ADDRESS: borgstede@umsl.edu
>
> Brian Borgstede I
> Telecommunications Engineer, I '68 Triumph
> University of Missouri, St. Louis I
> Instructional Technology Center I TR-250
> Phone: (314) 516-6433 I (or 2 or more)
> Fax: (314) 516-5294 I
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