Terrible clacking frim 300tdi - Defender Source
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  #1  
Old January 31st, 2015, 01:45 PM
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Terrible clacking frim 300tdi

Just finished a Big Bend run and we're on the side of the road. Cruising at 65 a small noise became a big clacking rattle from underneath the valve cover. Shut her down and pulled over. Pulled the cover while waiting on a tow and all but #7 rocker look fine. Not sure #7 is the culprit but it looks a little skewed? We head to Alaska in this thing in 2 weeks.... Or maybe not? Ideas of where to start would be greatly appreciated as I'm in rural Texas and this will probably have to do this all myself. Thank goodness for the Autohome!
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  #2  
Old January 31st, 2015, 01:50 PM
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#7 looks bent as if the valve got stuck in the guide.
I would pull the rockers and inspect all the push rods.

It could also be the head gasket is blown and the compression is making it's way under the valve cover.

Did you try starting it and looking for the culprit with the valve cover off?

We can schedule a call if that will help.
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Old January 31st, 2015, 02:24 PM
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Rover broke call a bloke, have you tried the birmabrite botherhood? there a couple of guys in San Antonio.

I would give the valve a whack and see if it is free, as I have once heard (but didn't believe) of a rocker cracking like yours.

Good Luck
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  #4  
Old January 31st, 2015, 02:33 PM
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Quote:
Originally Posted by roverman2010 View Post
Rover broke call a bloke, have you tried the birmabrite botherhood? there a couple of guys in San Antonio.

I would give the valve a whack and see if it is free, as I have once heard (but didn't believe) of a rocker cracking like yours.

Good Luck
The 300TDI is a zero tolerance engine.
Wacking it could cause the valve to break when it hits the piston and ruin the engine if the rotation is in the wrong position.

Wacking is a real bad idea.
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Old January 31st, 2015, 02:42 PM
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Didn't really mean to whack it hard, just enough to see ifs free.

OK, just try pushing down on it
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  #6  
Old January 31st, 2015, 02:51 PM
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What are you guys seeing in the picture that is wrong? Is a push rod bent? Rotate the engine through the full cycle. Any rockers with tons of lash? Is there a cap on number 7 valve?
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Old January 31st, 2015, 04:34 PM
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Quote:
Originally Posted by Red90 View Post
What are you guys seeing in the picture that is wrong? Is a push rod bent? Rotate the engine through the full cycle. Any rockers with tons of lash? Is there a cap on number 7 valve?
thats where I would start, lash cap fall out ?
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Old January 31st, 2015, 04:37 PM
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The first thing to do is check valve clearances.
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Old January 31st, 2015, 04:41 PM
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If you suspect 7. Rotate the engine until 7 is off the cam lobe and see how much you can rock the rocker back and forth. If its more than 10 thousandths you have a culprit. Hard to tell if its bent from the picture
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  #10  
Old January 31st, 2015, 04:51 PM
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Ok, l'm headed back to the truck. 1st: will check all clearances and adjust if needed. 2nd: if all well with clearances(have done clearance checks every 10K) pull rocker assembly and look at push rods. 3rd: if bent start ordering parts and build motor back up from the block(as per advice of guys on here). Our ferry for Alaska leaves NW Washington on Feb 19th...this should be fun. Thanks everyone for the Messages and posts. We needed a hotel rom and en suite shower for the night anyhow.
Will let everyone know the outcome.
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Old January 31st, 2015, 05:01 PM
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If the lash cap is missing look for it. It can't escape. Check for loose rocker hold downs.
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Old January 31st, 2015, 07:00 PM
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So push rods are straight and not missing caps. Turned motor over by hand but seemingly no more resistance than usual. Clearances correct.
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Old January 31st, 2015, 07:03 PM
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Oil level? Or...does it look/smell like diesel (ie leakdown)?
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  #14  
Old January 31st, 2015, 07:32 PM
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Exhaust leak?
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Old January 31st, 2015, 08:19 PM
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I'll add exhaust leak to the checklist tomorrow -my EGT had been running a little hot with the headwind we dealt with yesterday and today now that I think of it. Different sounding clack in motor turned to full bore tremors and "marble in a blender" once we came to a full stop.

Lav- oil level looked spot on. Gonna drain oil in the morning so see what comes out
Thanks again all. The AutoZone counter consensus was a thrown rod. Joy.
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Old January 31st, 2015, 08:44 PM
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Doubt it could run with a thrown rod. The piston almost touches the head normally. This is not like the engines the boys have seen.
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Old January 31st, 2015, 08:53 PM
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Sounds serious. Next thing I would do is drain the oil and drop the pan.
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Old January 31st, 2015, 09:12 PM
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There is nothing to see with the pan off.
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  #19  
Old January 31st, 2015, 09:16 PM
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my rationale is to see what bits are in the pan
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Old January 31st, 2015, 09:17 PM
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I wouldn't let anyone at AutoZone diagnose a crack in an egg!
F-ing MO-RONS!

I once had an oil spray tube fall off (you know the ones that cool the piston skirt from underneath). I doubt it would make a clacking noise if that had happened but is it possible that something else fell off in the lower end?

Could your timing have slipped causing some mistimed injection?
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