Pictures of timing chain

JasonNC

Anyone have a picture of the timing chain once the cover has been removed? I'm particularly interested in what the timing marks on the timing gears look like.
Thnaks,
Jason

Uncle Josh

There are prick punch marks on the front of both sprockets. This drawing is from the Hudson shop service manual with my notes. A pitch of course is from one sprocket hole on the chain to the next. My 14 pitch note didn't make the pic.

JasonNC

I took the timing chain cover off and in addition to the chain sagging like crazy, the timing mark on the cam gear is at 8 o'clock while the mark on the harmonic balance gear is at 2 o'clock and the timing mark on the flywheel is pointing to TDC. I have no idea as to what to do next. Any suggestions will be greatly appreciated.
Thanks,
Jason:sick:

Unknown

The relationship of the camshaft gear, crankshaft gear and the flywheel timing mark are predicated on proper installation of all components. The situation you now face is a stretched timing chain... not unusual for Hudson flathead 6 engines and the need to realign all components when installing a NEW timing chain.

Assuming you have a replacement chain designed for your application and other than a stretched chain the mechanical condition of the motor is serviceable, my suggestions are:

1. Go to the HET Club website and download the 1948-52 Hudson Shop Service Manual

2. Go to the engine section and review the timing gear installation information starting on page 3-33 PAY CLOSE ATTENTION to the NOTE: at the bottom of page 3-37. NOTE: Timing chain and sprockets should be installed with #1 Piston on top dead center with marks on sprockets 14 pitches apart, Figure 44. Timing Chain is not adjustable. Also see "Valve Timing".

3. Before making any parts changes assure you have done as instructed in the NOTE. To bring the engine to top dead center you should remove the #1 Spark plug and with a suitable probe (screwdriver will do) mechanically turn the engine over until the piston is at top dead center. This may require you to reinstall the crank shaft nut to turn the crankshaft.

4. Check the timing mark on the flywheel it should show TDC or close to it. If the mark is not seen bring the engine around again until the screwdriver registers top dead center once more. At this time the TDC timing mark should be in the window hole of the rear engine plate.

5. After attaining top dead center with #1 Piston the two marks on the crank and cam shaft should be in alignment.

6. Follow the instructions in the Hudson manual to install chain, and complete the reassembly of removed parts.

Good Luck

JasonNC

Hudson308 wrote:

That's all good advice, WW. Remember also that the mark on the cam gear will be in one of two places when the crank is at TDC. The cam will either be oriented for #1 firing, or #6 firing. Crank position will be the same, but valve position will correspond to one or the other. The timing chain marks as shown in Uncle Josh's (service manual) drawing correspond to #6 firing.

Now I AM confused. Based on the picture from the old thread and the diagram from Uncle Josh, I positioned the cam gear and crank gears at 2 o'clock and the timing mark on the flywheel in line with the timing mark. Before I did that, #1 was at 11:00 o'clock and the would crank and run. Now #1 is at five o'clock at TDC. Should I reposition my wires to correspond with #1 being at five o'clock?
Thanks,
Jason

Unknown

JasonNC wrote:

Hudson308 wrote:

That's all good advice, WW. Remember also that the mark on the cam gear will be in one of two places when the crank is at TDC. The cam will either be oriented for #1 firing, or #6 firing. Crank position will be the same, but valve position will correspond to one or the other. The timing chain marks as shown in Uncle Josh's (service manual) drawing correspond to #6 firing.

Now I AM confused. Based on the picture from the old thread and the diagram from Uncle Josh, I positioned the cam gear and crank gears at 2 o'clock and the timing mark on the flywheel in line with the timing mark. Before I did that, #1 was at 11:00 o'clock and the would crank and run. Now #1 is at five o'clock at TDC. Should I reposition my wires to correspond with #1 being at five o'clock?
Thanks,
Jason

Jason

The ignition timing ... or the postion of the wiring in the distributor cap is conditioned on the PROPER mechanical relationship of the cam and the crank timing. Once the cam and crank timing are in order orientate the wiring in the distributor cap to follow.

Not to open a another can of worms, the drawing that is posted by Uncle Josh is the HUDSON drawing for correct mechanical timing for a 232,262 or 308 engine. TDC for number 6 is what Hudson recomended. As Hudson 308 states... this can also be done using cylinder number one. In either case, as was originally stated, distributor cap timing is done after the cam and crank timing is correct.

Good Luck