Rocker Arm Guide...what?
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HT4100 4.1, 4.5, 4.9 Discussion, Rocker Arm Guide...what? in Cadillac Engine Technical Discussion; OK Cylinders 1 and 5 arent firing. Did a compression test...its 150 psi on both so its fine. WELL I ...
  1. #1
    Lonnie Jr is offline Cadillac Owners Member
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    Rocker Arm Guide...what?

    OK

    Cylinders 1 and 5 arent firing. Did a compression test...its 150 psi on both so its fine. WELL I didnt...a shop did. He also checked injectors, cap+rotor, and firing order. Its all fine.

    He says the only other thing he can think of that it could be is the Rocker Arm Guide is broke. Googled it to check the price...doesnt say anything. SOOO what is the technical name for it? Lol

    About $100 for labor and whatever the cost of the part is.

    Car is a 1990 Cadillac Sedan Deville with the v8 273 4.5L.

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    carnut is offline Cadillac Owners Master
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    Re: Rocker Arm Guide...what?

    Technical term--- rocker arm guide or support. Its specific to the 4100 thru the 4900 series Cadillac engines. If broken, the rocker arms will not open/ close the valves. Usually there is a valve train noise as well. Simple enough to confirm, remove valve cover.

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    Lonnie Jr is offline Cadillac Owners Member
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    Re: Rocker Arm Guide...what?

    Quote Originally Posted by carnut View Post
    Technical term--- rocker arm guide or support. Its specific to the 4100 thru the 4900 series Cadillac engines. If broken, the rocker arms will not open/ close the valves. Usually there is a valve train noise as well. Simple enough to confirm, remove valve cover.
    Well their is a clicking noise coming from the engine or pulleys

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    Lonnie Jr is offline Cadillac Owners Member
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    Re: Rocker Arm Guide...what?

    Bring
    Up
    My
    Post

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    ehall's Avatar
    ehall is online now Cadillac Owners Connoisseur
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    Re: Rocker Arm Guide...what?

    they are called pivots and they break all the time, might be your problem might not, only have to pull a valve cover to check



    see the crack? about $8 each from the local dealer

    sometimes when this happens one of the bolts holding the pivot in place will get stripped out of the support bar and the support also has to be replaced. those are about $40 each from the local dealer

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    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: Rocker Arm Guide...what?

    Those things are brittle as hell. I think I snapped 3 of them simply by untorquing one side all the way as opposed to a little on each side until they where off. Put them back on very carefully the same way.

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    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: Rocker Arm Guide...what?

    Wouldn't they make a lot of noise if the rocker pivot failed? I don't know how a distributor can give spark to 6 of the cylinders and not to 2 of them. The cap or the wires is not getting the spark there if that is the case. It could very well be a couple dead injectors though.

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    ehall's Avatar
    ehall is online now Cadillac Owners Connoisseur
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    Re: Rocker Arm Guide...what?

    Quote Originally Posted by cadillac_al View Post
    Wouldn't they make a lot of noise if the rocker pivot failed?
    Not necessarily. Each pivot is actually a pair of pivots (one for each valve) and if the bridge piece breaks in the middle like in the pic above but the pivots stay in place then they will keep working like nothing is wrong. However if the bolt comes out of the support bar then the rocker and pushrod will eventually come loose as well, possibly followed by the lifter. Depending on how the parts end up it can make a really bad racket, or it can sound like a slight miss accompanied by a loss of power. The last time this happened to me the lifter came out of the valley and the pushrod was pinched to the side, didn't make any noise at all, and I spent a couple of days trying to find a vacuum leak.

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    ehall's Avatar
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    Re: Rocker Arm Guide...what?

    Quote Originally Posted by Ranger View Post
    Those things are brittle as hell.
    yeah they are aluminum but they feel like they are made from pot metal

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    Ranger's Avatar
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    Re: Rocker Arm Guide...what?

    From my experience I'd have sworn they where made of glass.

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