First off all the engine is most likely the 126T02-3206-B1, which is the number we need if we're working on the engine.
The model number of the mower is good to have, but it's the engine we're working on and Toro doesn't make the engine, Briggs does.
You only stated the engine had a "rod knock"...
I am curious, this SAE 30 oil...
Is it a detergent oil?
Because it's easy to purchase NON-detergent SAE 30 without realizing it, and for gasoline engines it is essential to use a detergent oil.
Also SAE 30 is really thick...
Especially conventional oil, even if that's what the manual says.
I...