Ford 4600 [ sound]

On an IH 1466 it was a broken pushrod on the exhaust. The second time it happened we replaced all the exhaust pushrods.

The exhaust doesn't dump the pressure and when the intake opens it finds a place to go.

Pull the valve cover and look.

RT (my 2 cents)
 
Before you go tearing things apart try using something like Marvel Mystery Oil in the crankcase and in the diesel. Read the label. On the crankcase I'd put in the amount per number of quarts of oil recommended on the label. On the fuel additive I'd run 2x-3x what it says. Thinning the oil too much might cause other problems but in the fuel it will burn.......

Run it awhile at fast idle (to keep the heat up but minimize wear) and turn it off and let it sit for an hour or so.....give the stuff time to soak in. Do that several times.

If you get it cleared up I'd add something to the diesel for upper cylinder lube. I used to use a quart of ATF to 100 gal of diesel on my OTR and had zero problems. Cheap insurance.

Mark
 
Mark, with all due respect... this is one of those times where it just needs torn apart to find out what's wrong. Short of a bent exhaust push rod as been suggested he's either got a burn valve or a bent valve stem or an adjustment issue preventing the valve from closing. These are interference fit engines so the piston is generally going to knock the valve home anyway. It's of the greatest importance that he gets in there now and finds the problem and fixes it before it makes a much bigger problem. One valve and grind is not a big fix along with a head gasket.

Rod
 
Thanks Rod for being polite. Guy comes on here with a problem. No idea as to history. Lots of guys use no upper cyl lube, lug engines, leave them idle in cold temps for hours on end and all, run oil that you could use for chocolate syrup that was changed a couple of years ago I think, and on and on. Leaves the solution open to the imagination, mine anyway.

Mark
 

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