3.6 turned to the wrong direction !

Jim Hunter · 12-01-2007, 09:16 AM

Hi,

A friend of mine told me that he try to turn over the dissasembled (longblock)
engine ("P" 964 engine) from the flywheel by hand but in some point is some resistant from the engine.He turn over the engine 3-5 times by hand.
When I came to take a look I realise that he try to turn over the engine to the wrong direction !! When I turn it over to the correct direction it turns over super smooth.Possible any damage to any part ???

Longblock with :distributor removed ,all spark plugs removed.

TIA,
Jim

rvanderpyl · rvanderpyl's Garage

Possibly skip a tooth on the timing chains as turning the wrong way is going to try to collapse the tensioners and leave slack in the chain .

Jeff Alton · 12-01-2007, 04:28 PM

A quick check of the cam timing would confirm this. How many times did it go the wrong way? 3-5 times?

Cheers

Eagledriver · 12-01-2007, 04:55 PM

Jim,

Most likely no damage unless the engine was forced. Just check the cam timing while turning in the correct direction as suggest by Jeff. If you are worried about a bent valve you can put the spark plugs in and turn the engine over by hand listening for leakage past the valves. If you spray a little WD 40 on the valves when you do this you'll hear hissing and bubbling (might see this also if you look in the port).

-Andy

Jim Hunter · 12-01-2007, 10:14 PM

Thanks for the quick help quys!
I turn the engine and I was see all the intake valves are seated properly possible then a exhaust bent valve ???
Engine was turn in the wrong direction 1-3 times.

Thanks!
Jim

Eagledriver · 12-02-2007, 05:58 PM

It is possible you have a bent exhaust valve. Slack in the chain will result in advanced timing which means the exhaust valve will still be open when the pistons goes to the top. Look at the bright side, at least you found it now instead of after you installed the engine.

-Andy

Jeff Alton · 12-02-2007, 08:58 PM

You can do a leak down (even on a cold engine) to see if there is a bent valve. It will not seat properly and there will be a large leak present.

cheers

Eagledriver · 12-03-2007, 09:23 PM

I think my previous post was wrong. Slack in the chain will indeed advance the cam but that would cause the exhaust valve to close early. The intake valves would be vulnerable because they would be furthur open when the piston arrives at TDC.

-Andy