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Diagnostic Now....Broke XJ shaft, melted rotor. Cause?

dhcomp

dhcomp

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Ok, so my burb died suddenly on the freeway, and won't restart.

Turns over slow. Current guess is timing chain break.

Any way to verify w/o pulling the cover?

Sounds like I have to strip the front of the motor, and drop the pan to change this chain, so would like to verify first.

Any tips / ideas?
 
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It would be a compressionless cranking sound too. wirrrwirrrwirrrwirrr type sound. Certainly not normal sounding.
 
I still stand behind bad timing like I said in yur build thread.
The hard cranking is a tell tale.:dunno:
dhcomp said:
Ok, so my burb died suddenly on the freeway, and won't restart.

Turns over slow. Current guess is timing chain break.

Any way to verify w/o pulling the cover?

Sounds like I have to strip the front of the motor, and drop the pan to change this chain, so would like to verify first.

Any tips / ideas?
Click to expand...
 
Keep in mind that even if the rotor still spins, the chain also could have just skipped teeth. To determine if that happened, get the motor to tdc on #1 and pull the dist cap. If the rotor is not pointing anywhere near #1 terminal on the cap (or #6 if your at the wrong tdc), but the rotor still turns, It's just skipped teeth.
 
Well, rotor still spins. May have skipped a tooth.

Ice, i agree, it sounds like timing to me....but distributor isn't loose, and it was properly timed and drove almost 100 miles.

Haven't checked spark, will do so tomorrow. Bad Coil? It is one of the few remaining ****TY kragen items on the top of my motor.
 
dhcomp said:
Well, rotor still spins. May have skipped a tooth.

Ice, i agree, it sounds like timing to me....but distributor isn't loose, and it was properly timed and drove almost 100 miles.

Haven't checked spark, will do so tomorrow. Bad Coil? It is one of the few remaining ****TY kragen items on the top of my motor.
Click to expand...
You did say it was cranking slow right?
Could it be your battery is bad or the battery connection is bad?
otherwise if not, then it must be something in the engine that is making it hard which usually is too much retarding.
As I said in the other posts, if the dist itself is bad, ie weights fell or spring broke, it could be changing the initial timing.:dunno:
 
I always thought the 350 was an interference engine.

EDIT: upon further research(googling) it would appear that a stock low performance 350 is not an interference engine.
 
SBC and BBC ARE interference engines. In my days as an automotive machinist I can't count how many times I had heads in my shop with bent valves from a bad timing chain.
 
4X4HIGH said:
SBC and BBC ARE interference engines. In my days as an automotive machinist I can't count how many times I had heads in my shop with bent valves from a bad timing chain.
Click to expand...


Guess i was wrong about the SBC then.

Well, sound like my timing chain isn't broken.

Next guess?
 
Have fuel, first thing to check tomorrow is spark.

Have a spare coil i can throw on there if no spark.

What would be my next bet?
 
To check the timing. I know you said It's tight but might as well see where It's at. Also, just to be double sure that everything is ok, just get the motor at tdc and see what terminal the rotor is pointing it.
 
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