The Ford Barn

texkbc · 06-07-2016, 12:53 PM

I have a 272 that was running great until I made a stupid mistake and mounted a valve cover upside down( after new gasket install)

Started up and realized the rockers were hitting the cover. I dropped a push rod. I got the push rod back in place and adjusted the valve lash. Now I have backfire and seems like it is out of timing.

I tried to adjust timing but no fix yet....what else should I check?

could this have damaged a lifter or maybe timing chain skipped?

I am a novice so I would appreciate any suggestions

thanks

Bryan

Alaska Jim · 06-07-2016, 02:09 PM

you probably have the valve adjusted to tight and it is holding the valve open when it should be closed.

texkbc · 06-07-2016, 02:22 PM

Quote:

Originally Posted by Alaska Jim

you probably have the valve adjusted to tight and it is holding the valve open when it should be closed.

Jim,

I checked the valve lash and set everything to .016". ran a little better but still very rough.

Dobie Gillis · 06-07-2016, 02:30 PM

I agree with AJ, .016 is a little tight. Ford says .019 for a stock cam, set while hot. If your cam isn't stock then go by the cam grinder's spec.

willowbilly3 · 06-09-2016, 04:08 AM

Did you check all the pushrods and make sure there aren't more bent ones?

Ole Don · 06-11-2016, 08:19 AM

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The solid pushrods can be bent back straight with a hammer and a flat chunk of wood. A backfire means one rocker is too tight. >016 is not too tight, but must be adjusted at the base of the cam.

Ole Don · 06-12-2016, 10:52 AM

To adjust valves on a Y block Ford or Mercury.
With Motor at TDC, adjust cyl. one, I and E.
Two, I.
four E.
Five E.
Seven I.
Turn crank 180* 1/2 turn, adj. Four I.
Five I.
Six E.
Eight E.
Turn crank 270*,3/4 turn adj. Two E
Three I and E.
Six I.
Seven I.
Eight I.
This will work on all but the wildest cams. The books call for .019 or .018. Iskenderian says the gap can be adjusted down to much less to increase dwell and lift. If the ends of the rockers are dished, they can be ground for very little money if you find an old machinist with equipment who can do the work.
Print it out if you can.

06-07-2016, 12:53 PM	#1
texkbc Junior Member Join Date: Jun 2010 Location: Tolar,Texas Posts: 21	Need some advice please - Y block I have a 272 that was running great until I made a stupid mistake and mounted a valve cover upside down( after new gasket install) Started up and realized the rockers were hitting the cover. I dropped a push rod. I got the push rod back in place and adjusted the valve lash. Now I have backfire and seems like it is out of timing. I tried to adjust timing but no fix yet....what else should I check? could this have damaged a lifter or maybe timing chain skipped? I am a novice so I would appreciate any suggestions thanks Bryan

06-07-2016, 02:09 PM	#2
Alaska Jim Senior Member Join Date: May 2010 Location: Palmer, Alaska Posts: 1,575	Re: Need some advice please - Y block you probably have the valve adjusted to tight and it is holding the valve open when it should be closed.

06-07-2016, 02:30 PM	#4
Dobie Gillis Senior Member Join Date: May 2012 Location: Middle TN Posts: 1,060	Re: Need some advice please - Y block I agree with AJ, .016 is a little tight. Ford says .019 for a stock cam, set while hot. If your cam isn't stock then go by the cam grinder's spec.

06-09-2016, 04:08 AM	#5
willowbilly3 Senior Member Join Date: Sep 2011 Location: Black Hills, SD Posts: 577	Re: Need some advice please - Y block Did you check all the pushrods and make sure there aren't more bent ones?

06-11-2016, 08:19 AM	#6
Ole Don Senior Member Join Date: May 2010 Location: St. Michael, Minnesota Posts: 1,713	Re: Need some advice please - Y block Sponsored Links (Register now to hide all advertisements) The solid pushrods can be bent back straight with a hammer and a flat chunk of wood. A backfire means one rocker is too tight. >016 is not too tight, but must be adjusted at the base of the cam.

06-12-2016, 10:52 AM	#7
Ole Don Senior Member Join Date: May 2010 Location: St. Michael, Minnesota Posts: 1,713	Re: Need some advice please - Y block To adjust valves on a Y block Ford or Mercury. With Motor at TDC, adjust cyl. one, I and E. Two, I. four E. Five E. Seven I. Turn crank 180* 1/2 turn, adj. Four I. Five I. Six E. Eight E. Turn crank 270*,3/4 turn adj. Two E Three I and E. Six I. Seven I. Eight I. This will work on all but the wildest cams. The books call for .019 or .018. Iskenderian says the gap can be adjusted down to much less to increase dwell and lift. If the ends of the rockers are dished, they can be ground for very little money if you find an old machinist with equipment who can do the work. Print it out if you can.