WTF has happened to my injun?

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Trewey

Trewey

Cockernee, Pasty munchin bastid.
Posts
20,080
Location
Kernow - Near England
OK, here's the story so far.
Under heavy load there was a sudden loss of power, accompanied by a puff of black smoke from the exhaust and the engine died.
Attempting to re-start indicated no compression.
Looking through the oil filler, valves were still going up and down whilst cranking.
Whipping off the rocker cover 8 bent pushrods could be seen.
Lots of oil in the separator and more than normal in the turbo / air cleaner.
Front cover off and cam belt is perfect - no sign of damage / slippage, tension is good, tensioner looks good / spins freely. BUT Camshaft sprocket is 90 degrees out!
Rocker shaft out, cam belt off. push rods out and cam seems to turn OK by hand and all the followers go up and down as expected.
New cam-belt, tensioner and pushrods, set timing, adjust valve clearances and fire her up.
Running on 3, breathing heavily on #4. Pressure in crank case.

Head off and gasket blown big-time on #4 between the cylinder and the oilway near the pushrod.

I can't think how the HG failure and the cam / pushrod scenario connect, but one must have somehow caused the other.

Any injun eggspurts who can explain for me?
I is confoosed!!!:confused::confused::confused:
 
Last edited:
Trewey said:
OK, here's the story so far.
Under heavy load there was a sudden loss of power, accompanied by a puff of black smoke from the exhaust and the engine died.
Attempting to re-start indicated no compression.
Looking through the oil filler, valves were still going up and down whilst cranking.
Whipping off the rocker cover 8 bent pushrods could be seen.
Lots of oil in the separator and more than normal in the turbo / air cleaner.
Front cover off and cam belt is perfect - no sign of damage / slippage, tension is good, tensioner looks good / spins freely. BUT Camshaft sprocket is 90 degrees out!
Rocker shaft out, cam belt off. push rods out and cam seems to turn OK by hand and all the followers go up and down as expected.
New cam-belt, tensioner and pushrods, set timing, adjust valve clearances and fire her up.
Running on 3, breathing heavily on #4. Pressure in crank case.

Head off and gasket blown big-time on #4 between the cylinder and the oilway near the pushrod.

I can't think how the HG failure and the cam / pushrod scenario connect, but one must have somehow caused the other.

Any injun eggspurts who can explain for me?
I is confoosed!!!:confused::confused::confused:
Click to expand...

If you got it hot it is possible that cam seized in bearings, typically on over head cam engines, not overhead valve
 
Trewey said:
Shirley there would have been some damage to the cam belt in that case? It's like new!
Click to expand...

I've seen oil cooked by cylinder gases, I'd check the pulley hasn't spun on cam and cam bearing and faces.
Either that or it jumped a tooth
 
I gather the camshaft carrier is prone to breaking - that could have allowed the cam to tip and then jump.... long shot , but worth checking the carriers.
 
More bad news.
There's a 4 thou divot in the surface of the head, where the gasket had been blowing, so it will need skimming.
No 4 injector is siezed solid in the head and will have to be destroyed to get it out.

Woe is me.
 
I think that you may have lost a lot of oil pressure due to the gasket failure, and that you have had a seized camshaft. If that's right, then you're going to have to look at other bearings too.
 
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