What should be the change in cam gear?
A change of 4° or more should be noticeable; less than this may not be of much use. More coarse adjustment may be made by “jumping” the cam gear 1 tooth forward or back on the pinion gear, and fine-tuning this effect with the key offset.
What does the slash mark on the breather gear mean?
The matching breather gear has a “slash mark” (l) to identify its timing position. The late 1977 through 1984 (non-Evolution®) engines used a cam gear with a “curved tooth”. This gear is identified by a “groove” cut into the face of the gear. The matching pinion gear had teeth across only half of the width of the pinion gear body.
Why is the breather Assembly out of time?
The cam (s) and or breather assembly may be out of time due to “stacked” production tolerances (as well as the indifferent quality of some after-market replacement parts). There is no easy method of dealing with this, as the cam shaft and gear are 1 piece in the earlier engines. However, the following idea may prove useful.
What kind of noise does a big twin camshaft make?
If the gears are not matched prop- erly, you may witness some gear noise. If the gears are too loose, you will hear a “gear clat- ter” (much like a lifter noise), if the gears are too tight, you will hear a gear “whine”. When the gears are properly fitted, you will hear a very slight gear whine when the engine is hot.
A change of 4° or more should be noticeable; less than this may not be of much use. More coarse adjustment may be made by “jumping” the cam gear 1 tooth forward or back on the pinion gear, and fine-tuning this effect with the key offset.
The matching breather gear has a “slash mark” (l) to identify its timing position. The late 1977 through 1984 (non-Evolution®) engines used a cam gear with a “curved tooth”. This gear is identified by a “groove” cut into the face of the gear. The matching pinion gear had teeth across only half of the width of the pinion gear body.
The cam (s) and or breather assembly may be out of time due to “stacked” production tolerances (as well as the indifferent quality of some after-market replacement parts). There is no easy method of dealing with this, as the cam shaft and gear are 1 piece in the earlier engines. However, the following idea may prove useful.
If the gears are not matched prop- erly, you may witness some gear noise. If the gears are too loose, you will hear a “gear clat- ter” (much like a lifter noise), if the gears are too tight, you will hear a gear “whine”. When the gears are properly fitted, you will hear a very slight gear whine when the engine is hot.