4.0 SOHC... question

[CDW6212R]

Good work guys. BTW if you need an oil pump by chance, I replaced mine with a new one when I pulled the oil pans and balance shaft. Mine was 77,450 miles old and I didn't have any debris. I'd ship it for $25, once I find the Ford box.

 

[shelbygt]

I got the head, upper and lower oil pans and timing chain cover off today. I didn't see any damage to the head gasket though... http://www.explorerforum.com/forums/showthread.php?t=271943

The upper pan also had debris in the bottom of it, both metal and plastic! The lower tensioner was toast and the chain was loose.

Pics are with the motor inverted on the stand.

I don't know if I will replace the rear assemblies, I planned to replace the right head gasket, so I might. That rear plug is not sold in any kit is it?

I have a 98 Cobra with 4 overhead cams, but haven't had it apart, but I doubt it is not as bad as this V6.

 

[2000StreetRod]

rear cassette

Even if the rear guide assembly appears to be intact it could still have fractures in the plastic that might soon separate from the metal backing. It should not be necessary to remove the jackshaft plug to remove the guide assembly to inspect it closely. Since you have the head off you can verify what another member claimed - "his mechanic replaced the rear guide assembly without pulling the engine because the head had been removed."

The part number for the rear jackshaft plug is f77z6026ab and costs $8.79 from either tasca or tousley.

Thanks for posting the photos of the jackshaft tensioner. That is what I expect mine to look like. I can tell from the base that yours is the old style. The new style has a much larger base but not much different in looks otherwise. The chain contact material is supposedly more durable. There's an oil line in the casting that runs horizontally under the tensioner. I'd sure like to find a way to mount the OHV V6 hydraulic/spring ratchet tensioner in my SOHC.

The 4.6L DOHC V8 has timing chain guide wear problems but mostly on the slack side because the traction side is straight like it should be as shown in the photo below by Pontisteve.

The tensioners are the hydraulic/spring ratchet style and the contact surface is much larger to extend the life. There is no jackshaft so the chains are fairly long and flex (deflect) more than on the V6. In a few years I hope to purchase a 2000 Mustang GT and install the DOHC V8.

 

[2000StreetRod]

Flexplate bolts

What size are the sockets for the flexplate bolts? I purchased a 7 piece star socket set today but none of them seem to fit the flexplate bolts properly. The E12 socket is so tight I would probably have to drive it on with a hammer.

I received the primary timing chain kit today. The jackshaft sprocket bolt is another star that is bigger than the largest one in my set (E16). I'm hoping that it's E18 because I'm going to buy another star set tomorrow that goes up thru E18.

 

[CDW6212R]

I guessed that the jackshaft bolt will be E18, I had bought a set and one individual socket. My guess was right then, so I took the set back, and now I've misplaced that one star socket.

Ford used that kind of bolt for the flexplate too? They are great for anti theft, but why put them inside the engine.

 

[2000StreetRod]

Star socket set

I bought deep wall female external star socket set from Harbor Freight for $10. The sizes are E10, E11, E12, E14, E16 and E18. The E12 fits the flexplate crankshaft bolts and the E18 fits the jackshaft sprocket bolt.

6 PC. 3/8" DEEP WALL FEMALE EXTERNAL STAR SOCKET SET

 

[shelbygt]

Ditto... Harbor Freight rocks!

 

[CDW6212R]

Okay, "the E18 fits the jackshaft sprocket bolt(s)." Very good.

 

[skloczko]

Thanks for the tips Dale! At TDC the notches on both cams on mine are in exactly the same horizontal position ,parallel to the head surface.

It is much easier to understand how things work once you get the tools mounted.

Yeah at 192k miles, I would be an idiot not to do it all. I remember reading somewhere that there was a kit to order from Ford with all the timing parts, do the prices vary from dealer to dealer or is the Fast Parts Network a better choice?

Is this the left side of the engine with TDC at #4 piston? Or Right side with TDC on #1 piston?

Thanks!

 

[2000StreetRod]

which bank?

The photos are of the left (driver side) bank. The left and right camshafts are different. Only the left camshaft has the CPS protrusion. The photo shows the correct orientation for the left camshaft when the #1 piston is at top dead center on the compression stroke. If you had the right valve cover off you would see that the camshaft lobes would not be depressing the #1 cylinder valve stems and the notches would be parallel to the head surface and the notch offset would be above the axis of the cam.