IPB-Autosport 996 GT3 4 Liter

[IPB-Autosport]

Oil pump and shaft are out.




Note the dual pick-ups on the oil pump.



Crank comes out with the rods.




All bearings are pulled and a bare case half remains on the engine stand.



Sleeves are pounded out with a rubber mallet out of the cylinders.



Case and cylinders are pressure washed. Nice and shiny. Although, getting all the cosmoline off the exterior will take additional effort.




Here’s the interesting part. Note the recesses in the cylinders to accommodate the coolant. The sleeves maintain an opposite profile. When the machinist bores out the sleeve mating surfaces for the larger 4 liter sleeves (at the tops and bottoms), the rough cast surface will also need to be bored to maintain an adequate coolant passage and prevent flow restriction. The 2 rubber gaskets in the cylinders prevent the coolant and oil from mixing. An additional gasket is located at the top of the sleeve.