Struggling to fit pistons

90project · May 10, 2020

Hi all
Despite using a ring compressor, I’m struggling to get piston rings into a newly bored 2.5 block.
There doesn’t seem to be any chamfer at the top of the bore....should I get the file out?
If so how big a chamfer can I get away with? 30 degrees sound about right?
Thanks!
Andy

Gmacz · May 10, 2020

Did you check the rings fitted in the bore before putting them on the pistons.

90project · May 10, 2020

Gmacz said:
Did you check the rings fitted in the bore before putting them on the pistons.

Yes....just can’t get them past the top of the bore....now broken 2 oil rings!

jamesmartin · May 10, 2020

90project said:
Hi all
Despite using a ring compressor, I’m struggling to get piston rings into a newly bored 2.5 block.
There doesn’t seem to be any chamfer at the top of the bore....should I get the file out?
If so how big a chamfer can I get away with? 30 degrees sound about right?
Thanks!
Andy

shouldnt need one as said presumably youve checked the rings by removing them from pistons and fitting in the bore and checking with feeler gauge,what kind of ring compressor are you using,dont chamfer the edge

90project · May 10, 2020

jamesmartin said:
shouldnt need one as said presumably youve checked the rings by removing them from pistons and fitting in the bore and checking with feeler gauge,what kind of ring compressor are you using,dont chamfer the edge

freelance · May 10, 2020

Proper ring compressor and copious amounts of clean engine oil, yes you have one

90project · May 10, 2020

freelance said:
Proper ring compressor and copious amounts of clean engine oil, yes you have one

I’ll have another go then....wish me luck!

jamesmartin · May 10, 2020

90project said:
I’ll have another go then....wish me luck!

just carefully ensure its fully tight and rings fully compressed and you have the tool the right way up

90project · May 10, 2020

jamesmartin said:
just carefully ensure its fully tight and rings fully compressed and you have the tool the right way up

Thanks...I’m pretty sure I’ve got tool the right way up...unlike my photo...

tottot · May 10, 2020

Rings need to be gapped. Ones I had when doing my 2.2 diesel did anyway. This involved filing one end of the ring so it fits in the bore with a gap between its ends.
If I remember correctly .004 inches is the minimum, done near the top of the bore in the part where the ring travels not in the unworn bit at the top. As your is a rebore there will be no wear but still do it in the area the ring will be traveling.

potus · May 10, 2020

Sounds like you need to make sure the ring compressor is a bit tighter, they can be tricky but anything more than a gentle tap on the top of the piston, you'll end up breaking a ring.

Struggling to fit pistons

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