Re: Removal and rebuilding of a Twincam
Posted: Sat Apr 25, 2020 7:10 am
Now to continue with the dismantling of the block components.
Removed rear crank oil seal carrier
Removal of engine seal. The engine was sealed by attaching a numbered seal through a couple of the bolts on the front cover. This was done by the class eligibility officer when it was built after measuring bore and stroke before the head went on to verify it complies with the rules. I will need to get it resealed once I rebuild the bottom end to this point.
Removed the alternator brackets including triangular reinforcing bracket for where top connection mounts on the front cover. Even with this bracket you can get cracking in the front cover around where the top arm is mounted due to vibration in the nose of the engine at 8500 rpm+
Front cover unbolted and removed from back plate.
Jack shaft sprocket bolt locking tabs bent down and sprocket removed showing the adapter on the end of the jack shaft. Note I have turned down the heads of these bolts for clearance on the front cover as standard height bolts hit the cover
central bolt on back plate removed so the back plate itself can be removed. Paper gasket between block and backplate sealed using Loctite Aviation Gasket cement as was done with the other cork and paper gaskets. As well as sealing well I find this releases the gaskets with minimum effort for easy cleanup
jack shaft, crank and pistons / rods removal coming up next.... I hope I have not bored you to much so far
Rohan
Removed rear crank oil seal carrier
Removal of engine seal. The engine was sealed by attaching a numbered seal through a couple of the bolts on the front cover. This was done by the class eligibility officer when it was built after measuring bore and stroke before the head went on to verify it complies with the rules. I will need to get it resealed once I rebuild the bottom end to this point.
Removed the alternator brackets including triangular reinforcing bracket for where top connection mounts on the front cover. Even with this bracket you can get cracking in the front cover around where the top arm is mounted due to vibration in the nose of the engine at 8500 rpm+
Front cover unbolted and removed from back plate.
Jack shaft sprocket bolt locking tabs bent down and sprocket removed showing the adapter on the end of the jack shaft. Note I have turned down the heads of these bolts for clearance on the front cover as standard height bolts hit the cover
central bolt on back plate removed so the back plate itself can be removed. Paper gasket between block and backplate sealed using Loctite Aviation Gasket cement as was done with the other cork and paper gaskets. As well as sealing well I find this releases the gaskets with minimum effort for easy cleanup
jack shaft, crank and pistons / rods removal coming up next.... I hope I have not bored you to much so far
Rohan