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#2947 10/29/2004 12:20 AM | Joined: Aug 2004 Posts: 47 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2004 Posts: 47 | 235 thriftmaster, i think it's a '55, in my 51 1/2 ton.
1) Are my lifters hydraulic or mechanical & how do i tell.
2)I can find casting numbers on the block, but not a stamped serial number ...am i looking in the wrong place?
3)what year did chevy start using hydraulic lifters?
Thanks, guys.
bart | | | | | Joined: Feb 2004 Posts: 29,798 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,798 | There are lots of opinions on this, but generally, the engines that were installed in front of Powerglide transmissions had hydraulic lifters before they came into general use. By the late 50's, all the 235's had hydraulics. A quick way to tell is to pull the valve cover, and find a valve that's in the closed position. Clamp a vise grip onto the adjusting nut and rocker assembly, and hold steady pressure back against the pushrod for several minutes. A hydraulic lifter will bleed down, and the gap between the valve stem and the rocker arm will increase to almost 1/8". Don't worry, as soon as the engine starts, the lifter will refill and the clattering will stop.
Jerry
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| | | | | Joined: Aug 2004 Posts: 47 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2004 Posts: 47 | jerry,
thanks..i'll ask my mechanic friend to try that.
much appreciated.
bart | | | | | Joined: Jul 2003 Posts: 586 Shop Shark | | Shop Shark Joined: Jul 2003 Posts: 586 | I think your mechanic could tell by just listening to your engine. Mechanical lifters
will make a clicking noise on each valve, so the
engine will sound like someone is in the engine
rapidly taping with a small spoon. A hydraulic
lifter is much quieter. No taping sound above
idle. Cecil....... | | |
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