Timing Gear Info
Page created by T Feb 2nd 2012:
- 1 Timing Gear Info:
- 1.1 Early Camshaft Gears Are Imperial Size:
- 1.2 Later Camshaft Gears Are Metric Size:
- 1.3 Replacement As A Set:
- 1.4 Replaced Individually:
- 1.5 Camshaft and Crankshaft Gears Must be Matched:
- 1.6 Imperial Cam Gear Identification:
- 1.7 Imperial Crankshaft Gear Identification:
- 1.8 Gear Alignment:
- 1.9 Gear Matching:
- 1.10 Woodruff Keys:
- 1.11 Woodruff Keys And Timing Gear Installation:
- 1.12 Links:
- 1.13 Terms:
Timing Gear Info:
Holden Six Cylinder Engines (grey/red/blue/black) use Gears to drive the Camshaft.
Originally the Camshaft used a Fibre Gear.
Later an Alloy Gear was used to replace the Fibre Gear.
Early Camshaft Gears Are Imperial Size:
Early Camshaft and Crankshaft Timing Gears were Imperial (grey, red and blue motors).
Later Camshaft Gears Are Metric Size:
Later Camshaft and Crankshaft Timing Gears were Metric (black motors). Submission by HQJeff. Metric Pitch Timing Gears were introduced on 6 Cyl VK (black Engines). End of submission by HQJeff.
Replacement As A Set:
They can be replaced as a set (Cam Gear and Crankshaft Gear together).
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.
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.
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.
Woodruff Keys:The Crankshaft and Camshaft Woodruff Keys are the same 3/4" long x 3/16" wide.
Woodruff Keys And Timing Gear Installation:
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.