The Tao of Torque Wrenches. Piston compression rings seal to the bore via radial tension and combustion pressure, and each needs to be taken into consideration when fitting a set of rings to an engine.
There are two types of dedicated ring filers: Check the gap often and grind slowly to prevent ruining the ring. We will safeguard your e-mail and only send content you request. Old rings in position Overall the pistons were in good condition but there was certainly some cleaning required and also the top ring had a gap which was far too large.
I'm working on my own here so any feedback from those Lotus enthusiasts floating around "Blogger Bank" is welcome.
As for installation order, the top and second rings look very similar to each at first glance, but their designs are often quite different. Grind slowly, and make sure the gap is perpendicular to the bore and not angled.
The easiest way is to have a helper bump over the starter motor with the ignition key while you watch the engine. The most critical thing to check when installing piston rings is the end-gap.
The lower oil control ring is fitted first. Newer Post Older Post Home. We'll send you raw engine tech articles, news, features, and videos every week from TURNology.
The top two rings are called compression rings, and seal the combustion pressure. Use a feeler gauge to determine the preliminary ring gap.
You're one of the unfortunates with an "interference engine" -- an engine that can leave one or more valves still propped open far enough to contact a piston when the belt parts. A fender cover doesn't hurt either, to protect the paint from your belt buckle and dropped tools.
Ring 2 has an external note not internal step which must be oriented downwards and ring 3 is a 4 part system rather than the three part I removed.
More From Cars. Use a ring squaring tool—offered by ring manufacturers like Total Seal—to seat the piston ring squarely in the bore, and a feeler gauge to check its gap. Search for tasks- type in keywords. But as you can see in our photos, some lumber and an adjustable tiedown strap work just fine to support the powertrain while you remove that cumbersome motor mount.
For the crankshaft below, there probably will be a timing mark on the damper pulley that lines up with another mark on the lower cover. The new top ring was 1. Before proceeding, confirm which way the engine rotates during normal operation. Or, you may have to loosen the tensioner pulley adjustment bolt to release the tension and the belt.
Of course, now you'll have to reset your timing marks by hand. Piston rings perform a number of duties in an engine.
Once the ring is in the bore, use a feeler gauge to check the gap.