chev0545 231 #1 Posted July 17, 2019 (edited) did anyone ever hear of loose seats you can pull out with your fingers on a 520 Edited July 18, 2019 by chev0545 Share this post Link to post Share on other sites
lynnmor 6,762 #2 Posted July 18, 2019 They can get so loose that they fall out, They can wear the hole so large that it is beyond repair, even with welding. Why do you ask? 1 Share this post Link to post Share on other sites
chev0545 231 #3 Posted July 18, 2019 1 hour ago, lynnmor said: They can get so loose that they fall out, They can wear the hole so large that it is beyond repair, even with welding. Why do you ask? just tore one a part & found two.i guess it's toast Share this post Link to post Share on other sites
953 nut 51,524 #4 Posted July 18, 2019 @onanparts.com may be able to fix you up. Seems I recall them being able to machine the cylinder jug for over-sized valve seat inserts. https://onanparts.com/index.php?main_page=page&id=3 1 Share this post Link to post Share on other sites
lynnmor 6,762 #5 Posted July 18, 2019 It all depends how bad the block is, most can be repaired. Some automotive machine shops can make custom seats. Onan has .010" oversize seats that can be used if there is little play. Take the measurements, then report back. Share this post Link to post Share on other sites
