RE: Piston orientation after rebuild
Posted: Thu Mar 25, 2021 10:56 am
Hi All,
So I had my bottom end rebuilt last year, by a shop that I have lost all faith in.
He did not due his due diligence in several ways, and I am not feeling confident that I have a reliable engine.
All grumbling aside, now that I have this thing broken in- Stock 2.0 solid lifters. The engine is very loud at cruising speeds.
Details:
1) I did a top end rebuild about 1000 miles prior.
2) Dropped off a short block. with the pistons and jugs attached, as I wanted him to inspect the wrist pin fitting.
3) I think the new wrist pins did not like the existing rod bushings leading to noises, prompting me to have the case rebuilt.
4) Pins were found to be rocking in the rod bushings.
5) Rods and crank were sent out to 3rd party/s for grinding, polishing, pressing balancing.
As I said, the engine is loud. I think if it was out of balance, this would be evident at idle.
It has an extractor exhaust, which is louder that I would prefer, but I believe it is much louder than I remember.
I am confident that I checked the piston arrows to flywheel carefully. I believe the heads are properly tightened
(Engine was in and out 3 times troubleshooting leaks. Heads off twice. Was just as loud on both test runs)
Question:
Is it geometrically possible that the rebuilder flipped the pistons side to side- i.e. #2 is # 3 and #4 is #1 piston?
In this scenario, the wrong piston would still point to the flywheel.
So I had my bottom end rebuilt last year, by a shop that I have lost all faith in.
He did not due his due diligence in several ways, and I am not feeling confident that I have a reliable engine.
All grumbling aside, now that I have this thing broken in- Stock 2.0 solid lifters. The engine is very loud at cruising speeds.
Details:
1) I did a top end rebuild about 1000 miles prior.
2) Dropped off a short block. with the pistons and jugs attached, as I wanted him to inspect the wrist pin fitting.
3) I think the new wrist pins did not like the existing rod bushings leading to noises, prompting me to have the case rebuilt.
4) Pins were found to be rocking in the rod bushings.
5) Rods and crank were sent out to 3rd party/s for grinding, polishing, pressing balancing.
As I said, the engine is loud. I think if it was out of balance, this would be evident at idle.
It has an extractor exhaust, which is louder that I would prefer, but I believe it is much louder than I remember.
I am confident that I checked the piston arrows to flywheel carefully. I believe the heads are properly tightened
(Engine was in and out 3 times troubleshooting leaks. Heads off twice. Was just as loud on both test runs)
Question:
Is it geometrically possible that the rebuilder flipped the pistons side to side- i.e. #2 is # 3 and #4 is #1 piston?
In this scenario, the wrong piston would still point to the flywheel.