checking valve lash on a 5.0l
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checking valve lash on a 5.0l
I am assembling my motor after a having the block bored and a valve job done. Assembly is done to the rocker arms. I am using a Haynes manual for guidance, and am having trouble following the valve lash procedure.
The book says with #1 at compression TDC check lash on both #1 valves and #5 exhaust and #7 intake.
The #1 valves are closed and I can do the check, but #5 and 7 are open so the check cannot be done.
Do I have the cam and crank out of phase? or what am I missing?
Can some one with experience please help me, Thanks in advance
The book says with #1 at compression TDC check lash on both #1 valves and #5 exhaust and #7 intake.
The #1 valves are closed and I can do the check, but #5 and 7 are open so the check cannot be done.
Do I have the cam and crank out of phase? or what am I missing?
Can some one with experience please help me, Thanks in advance
FTE Legend
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From: Ottawa, Ontario
Assuming this is a late model motor the heads have pedistal mount rockers and there is no lash adjustment so there's no point measuring it. If you did have adjustable rockers the sequence followed depends upon the engine firing order, what is it on your motor?
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Hi Paul, thanks for responding.
The decal under the hood says 1,3,7,2,6,5,4,8.
The haynes manual says to check lash after machine work, and lash can be compensated for with longer or shorter push rods.
I've read a lot of your post and trust your advice, does any of this make sence to you, thanks, Fred
The decal under the hood says 1,3,7,2,6,5,4,8.
The haynes manual says to check lash after machine work, and lash can be compensated for with longer or shorter push rods.
I've read a lot of your post and trust your advice, does any of this make sence to you, thanks, Fred
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Yes this makes sense, but the valve lash should not have changed unless the block or heads were decked, and you won't get accurate numbers unless the lifters are pumped full of oil.
For that firing order the measuring sequence is..
With piston #1 @ TDC, check #1 In/Ex, #4 In, #3 Ex, #8 In, #7 Ex.
With crank rotated 180 deg from above, check #3 In, #2 Ex, #7 In, #6 Ex
With crank rotated another 270 deg, check #2 In, #4 Ex, #5 In/Ex, #6 In, #8 Ex.
For that firing order the measuring sequence is..
With piston #1 @ TDC, check #1 In/Ex, #4 In, #3 Ex, #8 In, #7 Ex.
With crank rotated 180 deg from above, check #3 In, #2 Ex, #7 In, #6 Ex
With crank rotated another 270 deg, check #2 In, #4 Ex, #5 In/Ex, #6 In, #8 Ex.
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Thanks Paul, This makes more sense to me, but I won't be able to see the engine until tomorrow now. Just to make sure I did things right, with the crank an cam installed (no heads yet) I brought #1 piston to the top of its travel, then intalled the timing set with cam gears dot at the bottom on verticle centerline and the crank gear dot at top on verticle cl. This should have set #1 piston at TDC compression stroke, right?
Fred
Fred
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Well at least I got the basics right. I still don't under stand the haynes or chilton procedure, oh well.
Thanks again , I'm back at it today.
Thanks again , I'm back at it today.
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Posting Guru
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Ford changed the firing order on the 302's. The book would be correct for the earlier firing order. That's why Paul asked which one you had.
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Hli Doug, well that eases my mind. It is kind of disconcerting to follow a procedure set out in a manual only to find it doesn't match the engine you're working on.
My Haynes manual covers Ford pu's 1980-96, do you know when the firing order was changed? What is the new order if you know it off hand? Thanks, Fred
My Haynes manual covers Ford pu's 1980-96, do you know when the firing order was changed? What is the new order if you know it off hand? Thanks, Fred
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The firing order changed in 1994 when the truck motors got the F4TE roller cam, and the "new" order is the 5.0HO/351 version that is on the decal under the hood of your truck. That does not make your 5.0 a HO though. And don't sweat the discrepencies in the Haynes manual, all basic assembly and maintenance procedures are common regardless of the firing order.
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