Timing Gear Info

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Page created by T Feb 2nd 2012:

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179 Engine showing the Alloy Camshaft Gear. 44AL says that the tooth pitch is imperial. Click to Enlargen. Photo by Jacks.

 

Timing Gear Info:

Holden Six Cylinder Engines (grey/red/blue/black) use Gears to drive the Camshaft.

Alloy Camshaft Gear and Camshaft from a 202 Engine. Click to Enlargen. Photo by Stuart.

Originally the Camshaft used a Fibre Gear.

Replacement As A Set:

They can be replaced as a set (Cam Gear and Crankshaft Gear together).

Replaced Individually:

The Gears can be replaced individually, but each Gear must match the same measurement type. Fitting a new Set makes good sense.

Camshaft and Crankshaft Gears Must be Matched:

An Imperial Cam Gear will not match a metric Crank Gear. An Imperial Crank Gear will not match a metric Cam Gear.

Imperial Cam Gear Identification:

By myeh 29/01/10@18:53 Shed LetsCruise 2560 The industry part number for the imperial aluminium cam gear is 44AL. Quote this part number or Google it and see what you find. End of submission by myeh. Imperial camshaft gears have 46 teeth.

Imperial Crankshaft Gear Identification:

The Crankshaft Gear is marked 44B.

Gear Alignment:

Some Posters worry that they may be 180 Deg out doing the Gear Alignment. Note it's only the Distributor installation that can be 180 Deg out. It does not matter which rotation the Crankshaft is on because it's the Cam Gear that determines when No 1 Piston is at TDC on the Compression Stroke. If your Gears only have 2 Marks, just make sure the 2 Dots line up and that's all there is to Gear Alignment. If your Gears have adjustable Markings, refer to the Gear Manufacturers Guidelines.    

Alloy Camshaft Gear from a 202 Engine. Click to Enlargen. Photo by Stuart.
 
 
Adjustable Crankshaft Gear for a red/blue/black Six Cylinder Holden Engine. Click to Enlargen. Photo by Hy_po.
Pieces of a stripped Fibre Gear from a blue 3.3 Engine. Photo by Ashley186. Click to Enlargen.
 
 
Grey 138 cu in Engine Crankshaft and Cylinder Head from Holden EJ. The Crankshaft Timing Gear is evident. Click to Enlargen. Photo by Stock-EJ.
 
Stripped fibre timing gear in a 202. Click to Enlargen. Photo by HG.
 
Metal timing gear in a 186. 44AL can be seen on the Camshaft Gear lower left when the image is fully enlargened. Click to Enlargen. Photo by Ludwig770.
 
 
Holden 6 imperial size fibre Camshaft Gear. Click to Enlargen. Photo by HRAmbo.
 
Holden 6 imperial size fibre Camshaft Gear. Click to Enlargen. Photo by HRAmbo.
 
Holden 6 alloy imperial size Camshaft Gear. Click to Enlargen. Photo by HRAmbo.
 
Holden 6 imperial size Camshaft Gear. Click to Enlargen. Photo by HRAmbo.
 
Imperial size alloy and imperial size fibre Holden 6 Camshaft Gears. Click to Enlargen. Photo by HRAmbo.
 
Imperial size alloy and imperial size fibre Holden 6 Camshaft Gears. Click to Enlargen. Photo by HRAmbo.
 
Holden 6 imperial size fibre and imperial size alloy Camshaft Gears. Click to Enlargen. Photo by HRAmbo.
 
Holden 6 imperial size fibre and imperial size alloy Camshaft Gears. Click to Enlargen. Photo by HRAmbo.
 
Holden 173 Camshaft and Crankshaft Gears. The dots only line up one Crank rev in two. Click to Enlargen. Photo by RedSeat .

 

Gear Matching:

the metric gears have v/k stamped on them if they are jp made. i keep at least one of each on hand and can easily match them to crank gears by simply meshing them, you can see very easily if they're wrong that way.

End of submission by Ben Simpson.

Woodruff Keys:

The Crankshaft and Camshaft Woodruff Keys are the same 3/4" long x 3/16" wide.

Just a bit of feedback for those in NZ searching for a crank key/woodruff/keyway for Holden 6. Found an engineering supplies place (Enco) that stocks the 3/4 x 3/16" bit. Had to buy 10 but still worked out as cheap as buying 2 off the shelf. (thanks for the help guys) On another note, just wanted to reiterate how easy it is to get the crank gear on by heating it (mentioned a few places here) for 15min @ 200oC in the pre-heated oven. I had pre-emptively got a drift made up by a local engineering outfit but didn't even need it. Grab your welding gloves once its up to temp & it slides straight on with absolutely no effort at all (very loose when hot). Once it hits the end, it cools & shrinks onto the crank. Sooooo easy - dont bother bashing it on. Gonna try heating the balancer also but using a heat gun (centre only) & report back on how many hits it takes this time.

End of submission by Redseat.

Links:

Six Cylinder Imperial and Metric Timing Gears

Stuart's Shed

Stripped Timing Gear

Terms:

Terms

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