V8 Question, but one that can apply to all engines

[Anonymous]

I'm a traitor and swapped a v8 into the Falcon, could not resist a free engine (ported E7 heads and 1.7 Roller Rockers) / transmission (AOD). Anyways, I had tightened down the roller rockers whenever there was not oil pressure to pump up the lifters. Now there is pressure and a smoke is coming out of my exhaust. I'm 100% sure it is not oil as it does not smell one bit and seems to burn my nose after a minute which leads me to think it is fuel. Would the method in which I had adjusted the roller rockers when the motor was dry make it so since they are pumped up the valves are staying open too long and unburnt fuel is coming out of the exhaust?

I still have the F150 with the 300 so I'm not that much of a savage.

...Forgot to mention. The engine revs up to 5 grand without a hitch, other than it backfiring a little bit after the gas is let out but I'm thinking that is due to the problem listed above, don't really dare to go any farther than that.

 

[80broncoman]

All the car makers adjust hyd lifters dry. What method did you use to determine how much lifter preload you have?
If you install new (never run at all) lifters in a engine then this method will work.
When you have lash or clearence in the valve train there is no resentance in spinning the pushrods with ones fingers. Simply get the lifter on the base circle of the cam and then spin the pushrod between your fingers while turning the polylock down when there is a slight drag on the pushrod you are starting to depress the plunger in the lifter. Back up and find zero lash and then turn the poly lock 1 full turn and lock it down.
This method also works if lifters have been run but you go from zero drag spinning the pushrod to not being able to spin it at all with your fingers when you hit zero lash. yes I would still use a full turn even then.
Both methods the lifter MUST be on the base circle of the cam.
Hope this helps

 

[Anonymous]

Hey, thanks for the info, I've been told before but always been kind of lacking all of the requireds, I've been out adjusting them for a while and the smoke has seemed to drastically decrease and that's only after a couple. Also found one collapsed lifter, now I have to yank off my perfectly sealed intake and replace that one, oh well at least that is an easy fix.

 

[addo]

Feel that I should append Jim's comment on the "one turn" final adjustment of the locking fastener. It depends on where the lock is. Theory of similar triangles means that one turn on the top of the pushrod (where many engines adjust) is appreciably less preload than one turn on the "centre" (not really) mounting stud.

Also, a collapsed lifter may well be salvageable. Check it before you chuck it.

Adam.

 

[Anonymous]

it was oiling through the lifter, but it wasnt pushing the pushrod up to where it needed to be, there is a massive gap between the seat in the roller rocker and the top of the push rod

 

[addo]

Dismantle and clean. You should save a couple of bob that way.

 

[Anonymous]

Hi guys and gals,
F.Y.I. To find the base circle of the camshaft to set the tappet clearances.
Use the firing order.
On a six cylinder engine, The firing order is 153624.
Set cylinder number six rockers to the rocking phase.
Rotate engine one way one rocker moves and back the other way the other rocker moves, on cylinder number three. This will happen within approximately 20/30 degrees of crankshaft rotation.
When this is happening cylinder number one rockers will be on the base circle of the cam.
Adjust as required.
Repeat this procedure through the firing order. As is number two adjust five. Number one rocking, adjust number six.
The hydraulic lifter or cam follower is designed to have an operating range for the internal piston to travel to achieve zero valve lash and operate correctly.
If this is incorrect, as in, aadjusted when the hydraulic lifter is empty then the piston in the lifter will be out of range and will either be noisy in operation or will hold the valve off its seat.
This will cause operating troubles, poor exhaust emissions and poor fuel economy. Poor exhaust emissions will cause burning of the eyes and other resparitory problems.
A simple way to adjust hydraulic lifters/tappets is to run the engine at a fast idle speed.
loosen off each adjuster till the tappet is noisy. Regular tap,tap,tap. Then slowly tighten the adjuster till the noise just stops. Continue tightening the adjuster for another half to three quaters of a turn.
This will have to be done reasonably slowly to allow the valve to seat correctly as the adjustment is carried out.
Do this to all and the system will give you no more trouble.
Noel.
Hope this helps, its easier than spinning a pushrod.

 

[Anonymous]

replaced the lifter and went through and adjusted all of them, problem went away, does not smoke anymore

 

[Anonymous]

Glad to hear alls well.
Noel.

 

[Anonymous]

thanks, even though i know some people were out there wishing evil upon the 302

 

[addo]

Only 25% of it.

 

[Anonymous]

And the other 75% of it better straighten up it's act... :roll:


--mikey

 

[Anonymous]

lol, that's funny, too bad my 300 has all that efi stuff on it (and is not really mine), otherwise id like to do some work on it.