Here is a link for the Toyota 2AZ-FE Repair Manual.
1. Balance Shaft timing in the repair manual is tricky and communicates incorrectly, to time it correctly make sure the engine is at TDC #1 then the timing marks they are referring to are LINES, not the circle or the adjusting holes.
a) engine @ TDC #1, make sure the LINES are facing opposite directions (lame terms, the empty circle should be facing each other, and the LINES facing opposite ends.
b) if your installing the balance shaft while the engine is outside (it has to be removed no matter what) timing the balance shift will be difficult as they are weighted and with turn 180 degree due to gravity, so make sure the LINES are facing opposite of each other.
This engine we have had in the family since new, 3-4k OCI on dino always on time...and still it was burning oil like it's free. Upon engine dis-assembly, I found out that the engine was VERY VERY clean, and all the bearings were in fantastic condition.
ONLY the pistons, were completely carboned up, and all three of the rings were stuck, it took me 6 continuous hours of using the old rings to clean the piston ring land of all it's hardened carbon build up.
My take on the cause would be that the pistons run at elevated temperature and dino oil is not enough, any motor oil that can resist break down at those temperature would be required. The pistons had plenty of oil return holes (8 per piston), unlike the 98-04 1zzfe motors were the lack of sufficient oil return holes (4 original, 8 updated Toyota design) was the cause.
I have personally not read on the 05-08 1zzfe motors with oil burning issues since they have the updated piston design, and we had 1 98 corolla with 310k with 3k OCI and another 99 corolla with 320k with 3k OCI since new before they started to burn oil, so to my understanding the design flaw was the contributor, where as in the 2AZ-FE the piston had 8 oil return holes per piston and still completely clogged up full of carbon.
1. Balance Shaft timing in the repair manual is tricky and communicates incorrectly, to time it correctly make sure the engine is at TDC #1 then the timing marks they are referring to are LINES, not the circle or the adjusting holes.
a) engine @ TDC #1, make sure the LINES are facing opposite directions (lame terms, the empty circle should be facing each other, and the LINES facing opposite ends.
b) if your installing the balance shaft while the engine is outside (it has to be removed no matter what) timing the balance shift will be difficult as they are weighted and with turn 180 degree due to gravity, so make sure the LINES are facing opposite of each other.
This engine we have had in the family since new, 3-4k OCI on dino always on time...and still it was burning oil like it's free. Upon engine dis-assembly, I found out that the engine was VERY VERY clean, and all the bearings were in fantastic condition.
ONLY the pistons, were completely carboned up, and all three of the rings were stuck, it took me 6 continuous hours of using the old rings to clean the piston ring land of all it's hardened carbon build up.
My take on the cause would be that the pistons run at elevated temperature and dino oil is not enough, any motor oil that can resist break down at those temperature would be required. The pistons had plenty of oil return holes (8 per piston), unlike the 98-04 1zzfe motors were the lack of sufficient oil return holes (4 original, 8 updated Toyota design) was the cause.
I have personally not read on the 05-08 1zzfe motors with oil burning issues since they have the updated piston design, and we had 1 98 corolla with 310k with 3k OCI and another 99 corolla with 320k with 3k OCI since new before they started to burn oil, so to my understanding the design flaw was the contributor, where as in the 2AZ-FE the piston had 8 oil return holes per piston and still completely clogged up full of carbon.
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