360 Engine Trouble / maybe crankshaft

if your engine runs fine with the clutch depressed, probably not the crank shaft but maybe something to do with the clutch / pressure plate components.

 

This just sounds......well......a bit off.....
NO engine has a problem with a capacity issue of a liter in either direction: so the alarms are all sounding from right there.....I suggest you seek another opinion
ADSAP...

 

Who told you this? I'm going to suggest you find a different mechanic, or a least get a second opinion.

 

Worst case with over fill by a liter, oil is sucked into the intake and burned through the engine. It would do this at a pretty slow rate as the oil returned to the tank and some oil was drawn into the intake instead of just vapor.

I don't think it's the crankshaft either. Sounds like something in the transaxle.

 

Not sure if the symptoms are exactly the same, but it sounds similar to this - https://www.ferrarichat.com/forum/threads/360-spider-wont-rev-when-rolling.527602/
IIRC, the issue was never resolved, but by bridging a switch on the clutch it was alleviated

 

I think your mechanic is thinking of "crankwalk" (search it on Google....big problem for Mitsu in the mid-late 90's and the MKIV Supra's to a lesser extent), however the symptoms are not what you describe. Get a second opinion, but betting money it is clutch related.

 

Hmm interesting.
You were previously unaware of the appropriate oil level check / fill procedure, but now you are certain that "if you overfill the engine by 1 liter, once you warm it up and step on it, you can indeed do damage to the engine !!" ?

I think it is highly unlikely that you have a bad crankshaft issue.
There are many other potential failures to investigate prior to assuming it is a bad crank.

I suggest you follow the advice of several posters above and gather 2nd / 3rd informed opinions.

Good luck.

Craig

 

That does not happen from 1 litre but several.
Might want to put a decal on the oil cap "check while running"
Could get a metal engraved one with a chain so it does not look stupid
I also think the crank is not the prblem and likely clutch

 

Ha, my oil was overfilled when I first got my car. Removed almost a quart with my "invention", then cleaned out the manifold. Any word on your motor? I always get freaked out with threads like this.

Image Unavailable, Please Login

 

Loose flywheel

 

Did you have flywheel work done to your car before this? Those flywheel bolts are ... one time used. BTW, it will be more than $10.

 

I looked up the cost and I was blown away, it's only $1.25 each.

Due to the tremendous torque and critical application, most flywheel bolts are replaced once they are removed. If you re-use them, they don't hold torque.

Look for record of rear main seal replacement due to leaks... if they did not replace the bolts, this could have happened. This engine puts our 400hp... you always replace the $1 bolts.

 

Unusual for those bolts to sheer off.

 

We had two instances of a flywheel coming loose on a rally car. The first was eventually tracked back to a cracked block- it was a 3 main bearing motor and the front main wasn't doing much. 3 days of rallying with all manner of things dropping off the car before it finally went 'bang' properly. The second time, slightly too long flywheel bolts were used- they bottomed in the crankshaft. So when they were torqued up, everything seemed fine but they weren't clamping the flywheel enough. The result of that was pretty much exactly like the pictures above. Genuine bolts should mean this isn't a possibility- often there is a disc 'washer' under them though- that could be needed. I always use locktite on flywheel bolts too...

 

I have seen this on other cars, but never a ferrari of any year. This is odd for sure.

 

WOW!

 

WOW!!!!

 

Those bolts were either too tight or too loose. I suspect an impact gun was used to put them on. You dodged a bullet there.

 

Tim - I think you are correct. The bolts exhibit tensile failure which was probably a result of too much preload (or someone re-used the flywheel bolts and stretched them even more trying to achieve torque) and then failed through cyclic fatigue (they began to loose torque and then came loose and broke).