Intake valve poppet removal

1959 - 1978, M151, M151A1, M151A2, Technical questions and discussions, regarding anything related to the M151.
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spurks
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Intake valve poppet removal

Post by spurks » Fri Nov 20, 2020 11:32 am

Aloha all,
This is my first post here and of course it's with a problem I'm hoping someone can help me with. I've been rebuilding the engine on my 1966 M151A1 and have hit a wall while working on the head. I've got the exhaust valves undone and cannot for the life of me get the intake valves off. The photos attached show the intake valve compressed. Is there a trick to getting the keepers out? I've not encountered valve poppets with this extra seat/guide around the keepers on other engines I've worked on (Series IIb land rovers and MGBs). Should I be compressing the valve at the point of the seat/guide instead of where I am currently compressing them and then using a hammer to unstuck it? I've used WD-40, PB-Blaster and am at the point I want to use hammers and heat but fear damaging the poppets. Any help is appreciated, I've got several extra engines and heads so I can always just swap if needed but as I've rebuilt the lower block already I don't want to half-ass the job and put a head on that's not been given the same TLC.
IMG_2568.JPG
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Rickf
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Re: Intake valve poppet removal

Post by Rickf » Fri Nov 20, 2020 6:10 pm

That is a lash cap and is supposed to be only on the exhaust valves. The rotators are also only on the exhaust valves but you have them on the intakes. Worse, you have a rotator alone on the one you are working on but the next one over has a rotator plus a sleeve! That cap will lift straight up and then you can remove the keepers as usual.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

spurks
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Re: Intake valve poppet removal

Post by spurks » Sat Nov 21, 2020 6:07 pm

I apologize for the poor picture, it's not the lash cap I'm referencing, here's a better one with the exhaust valve still in (on one of my many spare heads).
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I did manage to remove the valve though, I need to use my spring compressor on the valve seat and because it was stuck a good hit from a hammer to the end of my compressor screw freed it. I guess the culprit must be that the previous owner (my father) and his not really caring about the poor abused work horse farm MUTT would put old motor oil in instead of fresh stuff. All those sediments kept the seat and keepers kinda locked it in place. I've got a photo of the disassembled valve in the photo below with the culprit. The poor abused life this engine has had is why I've been doing the rebuild now that its mine. Three of my four pistons had one ring locked and the fourth one had both locked, no wonder my father complained about how it lacked power and wasn't reliable anymore! :lol:

Thank you again for your response, I'm always a bit worried about hitting things with hammers!
IMG_2574.JPG

Rickf
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Re: Intake valve poppet removal

Post by Rickf » Sun Nov 22, 2020 5:22 am

Before I try to remove any valves I always take a socket and a hammer and go down the line of valves and put the open end of the socket on the valve and give it a smack with the hammer. This breaks loose the bond between the keepers and the valve and the cap and makes life a lot easier when time to take it apart. I do this without anything holding the valves, they are free to move in case the keepers don't pop loose but this very seldom fails to work.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

Joe Gopan
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Re: Intake valve poppet removal

Post by Joe Gopan » Sun Nov 22, 2020 8:18 am

Not a good idea if you plan on reusing the valve, you may bend it.
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HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
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spurks
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Re: Intake valve poppet removal

Post by spurks » Sun Nov 22, 2020 11:26 am

That's why using a hammer was not my first resort and I wanted to see if there was some technique I was missing beforehand. I'll certainly check all the poppets with a flat edge to check for the slightest sign of being bent. I'm just glad to have gotten them off, as you can see, there's a lot of carbon and other gunk in there that needed to be cleaned out. Will be nice to reseat the valves properly and have new seals on the intake that actually feel like rubber and not that inflexible state the old ones are!

Rickf
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Re: Intake valve poppet removal

Post by Rickf » Sun Nov 22, 2020 2:47 pm

How are you going to bend a valve by tapping on the spring? If that were the case then the valve would bend when the rocker arm actuated it. I am not talking about taking a mighty swing with a 20 oz. hammer. I figured that went without saying but I guess you have to explain everything nowadays. I use a 12-16 ounce plastic dead blow hammer and I tap it more than hit it. Even with a steel hammer I don't see how you could bend a valve without actually trying to bend it by hitting it on an angle. Minus the socket.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

Joe Gopan
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Posts: 49296
Joined: Sun Mar 02, 2008 2:37 pm
Location: Proving Ground

Re: Intake valve poppet removal

Post by Joe Gopan » Sun Nov 22, 2020 5:10 pm

I thought you were striking the other end.
2011 MVPA PIONEER AWARD - MVPA #1064
HONOR GRAD-WHEELED VEHICLE MECHANIC SCHOOL 1960 - US ARMY ORDNANCE SCHOOL(MACHINIST) ABERDEEN PG 1962 - O-1 BIRD DOG CREWCHIEF - 300,000+TROUBLE FREE M-38A1 MILES
LIFE MEMBER AM LEGION-40/8-DAV
7 MIL SPEC MAINTAINED MV'S
COL. BRUNO BROOKS (ARMY MOTORS) IS MY HERO


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