Essex V6 front pulley(s) alignment SE6A

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Diyhell
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Essex V6 front pulley(s) alignment SE6A

Post by Diyhell » Sat Jan 19, 2019 9:18 pm

I'm mid timing gear replacement and have hit a snag with the three part front pulley for the power assisted steering model.

I unbolted the front section to get access for a socket and removed it, not realising that is not obviously keyed or marked as to which of the 4 ways it can go on is correct. Hmmm. Not a problem if it wasn't drilled for external balancing (of the crank I presume) but it is.

Any thoughts as how to tell which position is correct? I stopped as soon as I realised and think I marked the correct orientation. But I can't be 100% sure.

Then again, it's always seemed unbalanced so maybe it wasn't on correctly before!
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SE6a needing lots of work...

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Essex V6 front pulley(s) alignment SE6A

Post by Motolab » Sat Jan 19, 2019 9:26 pm

No worries mate! They are balanced like your wheel/tyre are balanced...those you also can fit in either position...

So every rotating part on your engine is individually balanced... Not together... (Would be nice, although.. But is rather expensive to do for a commercial car builder..)


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Essex V6 front pulley(s) alignment SE6A

Post by Oldconn » Sun Jan 20, 2019 9:52 am

For what it's worth, my 6A pulleys are not drilled at all; the first one has the counterbalance weight, there is no other evidence of attempted balancing.


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Essex V6 front pulley(s) alignment SE6A

Post by Diyhell » Sun Jan 20, 2019 10:58 am

Oldconn, that's what I expected to see. Harold, I get what you say but that's a lot of holes drilled on one side of an otherwise uniform pulley.

Anyone else got the front pulley with or without holes?


SE6a needing lots of work...

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Essex V6 front pulley(s) alignment SE6A

Post by Diyhell » Sun Jan 20, 2019 11:00 am

Btw, is it usual to have two belt spaces on the front piece?
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SE6a needing lots of work...

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Essex V6 front pulley(s) alignment SE6A

Post by Roger Pennington » Sun Jan 20, 2019 11:38 am

Errrm, that's not how I understand it, I'm afraid. Look at the back of the main pulley, with it's massively lopsided casting. There's no way that you'd make it like that, if you were building each piece to be individually balanced. It's always been my understanding that, as the V6 is an inherently unbalanced design, the bottom end (inc pulleys and flywheel) was in fact balanced as an assembly in production - not of course to race standards, but enough to do the job. I'd be inclined to look for witness marks on the face where they've been bolted together, which should give a reasonable idea of where it came from?
Having said all that, bearing in mind that it was only balancing to production standards, some people have swapped parts haphazardly without a disaster, but personally I'd prefer to at least make a stab at getting it right.

In fact, to quote from the factory Workshop Manual:

Crank Balance.jpg
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As regards the two belt positions, the inner smaller one is the PAS belt, the outer large one was for aircon on (Ford) cars so equipped.


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Essex V6 front pulley(s) alignment SE6A

Post by Roger Pennington » Sun Jan 20, 2019 11:42 am

And incidentally, don't forget to pop in the crankshaft pulley bolt and washer before you reassemble the pulley, if you are doing it off the car - it won't go in once the pulley is all together :wink:


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Essex V6 front pulley(s) alignment SE6A

Post by scimjim » Sun Jan 20, 2019 1:13 pm

I seriously doubt the crank, flywheel and front pulley were put together to balance during production. They will all simply be statically balanced to a specific figure by drilling metal out. That doesn’t mean the pulley is “balanced” itself, it means that the weight is offset by the correct amount to counter the crank (it has a key way, so only goes on one way). Of course, dynamically balancing with the pistons and rods etc is much more accurate.


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Essex V6 front pulley(s) alignment SE6A

Post by Roger Pennington » Sun Jan 20, 2019 1:54 pm

I didn't suggest that it *had* had a full dynamic balance in production. However, the difference between the drillings in the OP's pulley and oldconn's, does tend to confirm some basic balancing (even if only static). The significant point here though, is that there is no keyway on the outer half of the pulley, it can be refitted in any one of 4 possible positions.


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Essex V6 front pulley(s) alignment SE6A

Post by scimjim » Sun Jan 20, 2019 3:04 pm

You said “balanced as an assembly” Roger - that’s what I was questioning. The main pulley has the crank balancing mass, the outer half will be balanced independently, so not significant at all.


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SECURE DRY STORAGE FOR YOUR SCIMITAR

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), 1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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