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| | | | Joined: Dec 2012 Posts: 163 'Bolter | | 'Bolter Joined: Dec 2012 Posts: 163 | There are 3 different types of hydraulic lifters in my 56 235 pass engine. I want them to all be the same. Should there be a bleed hole in the rod seat or not? Most of mine have no bleed hole.I believe the ones with the holes are replacements. I can make the necessary cut on the plunger as explained on the forums. I just need to know which ones are original.
Thanks. | | | | | Joined: Apr 2005 Posts: 396 Shop Shark | | Shop Shark Joined: Apr 2005 Posts: 396 | This sounds like a Major Disaster waiting to happen. I think you should find out what cam you have and start with either all new rods and mechanical lifters or all new hydraulic lifters. Just my opinion, more knowledgeable engine help will be along shortly. Jerry
Jerry
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | There is no concern with mixed lifters.
Originally there would have not been a vent hole in the pushrod seat.
If these are in a running engine you run a risk of a flat cam by changing them. It is best to keep the lifters in the positions where they have worn into the cam.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Dec 2012 Posts: 163 'Bolter | | 'Bolter Joined: Dec 2012 Posts: 163 | I suspect the 4 replacements have only been in the engine a short time(maybe a year or so of infrequent driving) being as they looked new and came out easy. I have 4 of the original style ( not from this engine) so I thought it would be better to put them in in place of the replacements. The engine ran fine but had lifter noise even when hot.(lash was adjusted).I believe the older lifters were sticky with varnish. All have been cleaned.
Your thoughts would be appreciated.
| | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | When you say you have 4 of the original style, are they used?
You never want to put used lifters on any cam lobe that they are not worn in to.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Dec 2012 Posts: 163 'Bolter | | 'Bolter Joined: Dec 2012 Posts: 163 | | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | You can get lifters refaced but I would retry the ones you have cleaned. I hope you kept them in order as to where they came out.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Dec 2012 Posts: 163 'Bolter | | 'Bolter Joined: Dec 2012 Posts: 163 | Thanks. I did keep them in order so I will put all three types back in. Hopefully the cleaning will reduce the noise. I did your modifications to allow air to escape. | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | I can almost guarantee they will be fine.
Let us know how it turns out.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Dec 2012 Posts: 163 'Bolter | | 'Bolter Joined: Dec 2012 Posts: 163 | Runs nice and smooth and quiet after warming up! Only one engine problem remaining. The distributor moves around a lot when running causing the timing to be erratic when checking it with a timing light. The distributor has been apart and gone over. I did not see much wear or play. Bent shaft? Any ideas? Not the type of movement caused by the vacuum advance. Kind of an off center "rolling" movement. Thanks. | | |
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