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Author Topic: Camshaft Install 2003 Cobra Help  (Read 20578 times)
CarbedForGood
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« on: October 07, 2012, 11:32:11 am »

What's happenin' SBF Techhies!

This thread is sort of a continuation of http://sbftech.com/index.php/topic,33447.0.html since the topic is changing.

I've taken the heads off of the 03 Cobra since then and had them sent to the machine shop. They found the #8 valves insanely gunked up by some kind of caked on crap. He assumes it was some sort of engine additive which didn't dissipate correctly and very well may have had seating issues.
He also mentioned to check out the piston ring as it may have leaked down into the cylinder, though I'm not sure where to begin on checking that in my driveway.

The heads are back and ready to go back on. I've test fitted the MAC longtubes and it seems I'll need to raise the motor on the driver side a few inches to drop it in. I'm stuck on installing the camshafts back into the motor. I'm putting the same stock cams back with fresh oil as I heard I do not need installation grease. I'm sort of wondering if I need a special break in oil, like the old style which had phosphorus and zinc or whatever they took out of the new stuff.

Also I do not have a cam retention tool, I was told I can reinstall the cams by simple placing the chain on both cams and setting them in place with the tensioner at once. Then begin to tighten the cam towers down evenly until the cams push down on their own and fit into place. Has anyone ever performed this? And did you try to hold the cams with the timing marks pointing down as instructed while torquing down. Or did you let the cams sit in a more comfortable position, then hold them with a wrench to bring the marks to the 6 o clock pos. while installing the crank chains?

Cliffs:
  • Is it possible to check the health of a ring without dropping the oil pan
  • Do I need a phosphorus rich break in oil or installation grease when installing the same cams to the heads which came from the machine shop
  • Installing cams without the retention tool, where are the timing marks on the gears when torquing the towers down
Thx! 
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1988 Mustang LX
Joel5.0
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« Reply #1 on: October 07, 2012, 05:33:08 pm »

This is a "dual camshafts timing" installation.

#1. You "time" the individual camshafts/head and make sure they are in synch (key-ways @6 o'clock and timing marks @12 o'clock), release chain tensioners and confirm timing marks.


#2. Install timing chain exhaust cams sprockets and ensure timing marks are aligned with the crankshaft's.



#3. Instal timing chains, guides and tensioner assemblies (same procedure as with a SOHC 4.6L setup)


#4. To "verify" piston rings seal..... use some WD-40 or Marvel Mystery Oil and drench/fill the cylinder with the piston in its halfway position in the cylinder covering all the piston surface and note the lubricant's level...... let it sit overnight and check if you have any lubricant "leak-down" caused by failed rings. This is the poor man's rings seal checker heads off.

#5. NO... you do not need a flat tappet configured oil "soup" for a DOHC setup. Camshafts break-in is not required or called for in DOHC configurations.

LUK
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ACRONYMS:
LUK  LMK  JIC  BTSTDTRT  YCYDYP  NFI-YTM  SPOBI, and the classic... DILLIGAS

'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2


Quote from: Joel5.0
The right to be stupid is inalienable for sure however, there is no such thing as a right to impose stupidity onto others
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Knowledge based on external evidence is unreliable.
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The proof of understanding is the ability to explain it. (H. Torruella)
Ignorance is bliss, but stupidity is orgasmic.
Fraud and falsehood only dread examination. Truth invites it. (Samuel Johnson)
The chaotic resistance of the opponents leads to the conclusion that they are not prepared to meet the challenge. The problem is already much more psychological then technological. [Bojidar Djordjev]
Individuals are rational and humane... Crowds are reactionary and barbaric. (Jason)
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CarbedForGood
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« Reply #2 on: March 25, 2013, 05:20:41 pm »

I figured I'd follow up on the results of the rebuild.

I used your diagram to time the cams and everything went great. I didn't use the special tool to reinstall the cams, I simply placed the camshafts over the rockers as close as possible to the point where they should be and evenly tightened everything down. Worked great.

Car put down roughly 460/480 rwhp on the dyno even though the boost dropped from 13lbs to 10lbs at WOT through the powerband due to a faulty tensioner pulley and oversized belt.

Thanks Joel!! 
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Joel5.0
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« Reply #3 on: March 25, 2013, 07:44:11 pm »

 Thumb up
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ACRONYMS:
LUK  LMK  JIC  BTSTDTRT  YCYDYP  NFI-YTM  SPOBI, and the classic... DILLIGAS

'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2


Quote from: Joel5.0
The right to be stupid is inalienable for sure however, there is no such thing as a right to impose stupidity onto others
Great Thoughts will Overwhelm a Feeble Mind
There is never money to do it right, but there's always money to do it over.
Knowledge based on external evidence is unreliable.
He, who doesn't ask, does not deserve an answer.
A mind is like a parachute it only works when it is open.  (oldmanjoe)
If you can't explain it simply, you don't understand it well enough. (Albert Einstein)
Tuning on a Dyno for the track, is like swim practice in a bathtub.
I can explain it for you, but I can't understand it for you. (90lxcoupe)
The proof of understanding is the ability to explain it. (H. Torruella)
Ignorance is bliss, but stupidity is orgasmic.
Fraud and falsehood only dread examination. Truth invites it. (Samuel Johnson)
The chaotic resistance of the opponents leads to the conclusion that they are not prepared to meet the challenge. The problem is already much more psychological then technological. [Bojidar Djordjev]
Individuals are rational and humane... Crowds are reactionary and barbaric. (Jason)
The person who says it cannot be done should not interrupt the person doing it. –Chinese Proverb
Nothing sways the stupid more than arguments they can't understand - Cardinal de Retz
RunninHorse
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« Reply #4 on: March 26, 2013, 12:20:01 pm »

I figured I'd follow up on the results of the rebuild.

I used your diagram to time the cams and everything went great. I didn't use the special tool to reinstall the cams, I simply placed the camshafts over the rockers as close as possible to the point where they should be and evenly tightened everything down. Worked great.

Car put down roughly 460/480 rwhp on the dyno even though the boost dropped from 13lbs to 10lbs at WOT through the powerband due to a faulty tensioner pulley and oversized belt.

Thanks Joel!! 

Good job!   
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