OT: Any Jag or car-engine-sages here?

Catfish · 08-09-14, 04:13 PM

A bit OT here:

Not my car, but we have a problem: engine rebuilt, crankshaft in, oil pump and distributor shaft in, also primary chain at the front and the chain cover in place, no cylinder head, no camshafts yet.
All is well oiled and fitted with torque wrench -

Now when we turn the crankshaft, we need around 30 Newtonmeter to turn it (seems a bit much, but it's a 4,2 liter six cyl., pistons going up and down, primary chain with spanner mounted), however every 2nd revolution we have a "hard point", at which you need 40 Nm to overcome a sudden resistance.
A short resistance every 2nd turn - so my idea was it has something to do with an attached component that does 1/2 turn for every full crank revolution, right ? But the valve train is not fitted - no cylinder head.

My guess is it cannot be the crankshaft and main bearings itself, because it would then either happen once in a turn, or being a bit stiff during the whole revolution.

I also think that it should turn much easier than needing 30 Nm for turning, but i am not an expert with the 4.2 block.

Hmm

Anyone ?

Thanks and greetings,
Catfish

08-09-14, 04:13 PM	#1
Catfish Dipped Squirrel Operative Join Date: Sep 2001 Location: ..where the ocean meets the sky Posts: 17,765 Downloads: 38 Uploads: 0	OT: Any Jag or car-engine-sages here? A bit OT here: Not my car, but we have a problem: engine rebuilt, crankshaft in, oil pump and distributor shaft in, also primary chain at the front and the chain cover in place, no cylinder head, no camshafts yet. All is well oiled and fitted with torque wrench - Now when we turn the crankshaft, we need around 30 Newtonmeter to turn it (seems a bit much, but it's a 4,2 liter six cyl., pistons going up and down, primary chain with spanner mounted), however every 2nd revolution we have a "hard point", at which you need 40 Nm to overcome a sudden resistance. A short resistance every 2nd turn - so my idea was it has something to do with an attached component that does 1/2 turn for every full crank revolution, right ? But the valve train is not fitted - no cylinder head. My guess is it cannot be the crankshaft and main bearings itself, because it would then either happen once in a turn, or being a bit stiff during the whole revolution. I also think that it should turn much easier than needing 30 Nm for turning, but i am not an expert with the 4.2 block. Hmm Anyone ? Thanks and greetings, Catfish