 Tell me about swapping to hydraulic lifters |
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| JeffBowlsby |
 Jun 3 2016, 04:28 PM
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#1
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914 Wiring Harnesses & Beekeeper  Group: Members Posts: 8,907 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None 
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I hear they are done to eliminate valve adjustments on a T4 motor.
Other pros/cons? Is there machining required or are they drop in and thus reversible? |
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| MichaelB |
Jun 3 2016, 05:04 PM
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#2
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Newbie Group: Members Posts: 23 Joined: 24-June 12 From: Wisconsin Member No.: 14,598 Region Association: None |
I am not the expert opinion you are looking for but on the engine I rebuilt, started with a GA case (supposedly "unmolested") motor that had hydraulic lifters and dished pistons (which with the 914 2.0 heads must have dropped the compression a pretty good bit). I replaced both the pistons and added a 9590 kit. The case did have the secondary oil pressure relief valve (under cylinder 1) and it had copper plug behind the screw/plug to block it off. I believe most bus motors with hydraulic lifters had this plugged from the factory. As we know the bores for these relief valves are often poor/irregular or worn (and leak or stick). If you have a secondary valve, addressing it might be a consideration in keeping pressure up for the hydraulic lifters.
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Posts in this topic
Jeff Bowlsby Tell me about swapping to hydraulic lifters Jun 3 2016, 04:28 PM
mepstein You don't do it on a 914 motor since you want ... Jun 3 2016, 04:46 PM Bleyseng
I hear they are done to eliminate valve adjustmen... Jun 3 2016, 05:12 PM larryM https://www.google.com/search?q=914+hydraul...-8... Jun 3 2016, 10:43 PM Dave_Darling Ramp rates on the cam have to be set up for the hy... Jun 3 2016, 11:04 PM rhodyguy Very annoying when the lifters have to pump up aft... Jun 4 2016, 08:17 AM
r_towle It works, not optimum but it can be a dropped in t... Jun 4 2016, 09:19 PM |
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