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Thread: Knock knock... what's this?

  1. #81
    Yoda CJD's Avatar
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    Re: Knock knock... what's this?

    And the small cam lobe is for the fuel pump. Which, by the way CAN cause a knock too for certain failure modes.
    John

    Most of a 1955 TR2

  2. #82

    Re: Knock knock... what's this?

    Yes, obviously not valve guides... have too many projects on this car going at once. 😜 Luckily I attached a photo so it was very obvious those were not valve guides. I thought the cylinder walls were scored, but I don't fee anything there. Keep searching. Will test clearance on the old main bearings with plastigauge tomorrow and hopefully pop the new ones in and viola! We'll see.
    *1959 TR3A
    *1951 Chevy Fleetline Deluxe
    *1986 GMC Sierra Classic

  3. #83

    Re: Knock knock... what's this?

    Just a quick update: I ordered the wrong seals so I have a couple more days until I get the right ones in. But I did check the clearence with Plastigage. I am showing .002 on the con bearings. That doesn't seem like that big of a gap. Worth the knock?
    *1959 TR3A
    *1951 Chevy Fleetline Deluxe
    *1986 GMC Sierra Classic

  4. #84
    Jedi Trainee Merlin63Tr4's Avatar
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    Re: Knock knock... what's this?

    You have to be careful how you measure clearances with Plastigage. All oil has to be wiped from surfaces to be measured, care must be taken to not rotate the surfaces being measured while the Plastigage is in place, etc, etc.
    Is the above measurement with the new bearing shells or the old?
    Big end bearing clearances when the TR engines were newly manufactured were in the range of 0.0028 to 0.0040......

    M.
    Last edited by Merlin63Tr4; 06-21-2017 at 12:14 AM.
    Merlin the '63 Tr4.... it grows younger !

    "A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools." -- Douglas Noel Adams (1952-2001)

  5. #85

    Re: Knock knock... what's this?

    Thanks for the reply...

    It was wiped and steady

    this was the old bearing. I will measure the difference with a micrometer on the new shells vs. the old shells when I receive them. Fingers crossed I can wrap this up with some success, I don't know what else I can check!!

    Anything else before I close the bottom?
    *1959 TR3A
    *1951 Chevy Fleetline Deluxe
    *1986 GMC Sierra Classic

  6. #86
    Yoda CJD's Avatar
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    Re: Knock knock... what's this?

    Are you using a mechanical fuel pump?
    John

    Most of a 1955 TR2

  7. #87

    Re: Knock knock... what's this?

    I am using mechanical fuel pump...
    *1959 TR3A
    *1951 Chevy Fleetline Deluxe
    *1986 GMC Sierra Classic

  8. #88
    Yoda CJD's Avatar
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    Re: Knock knock... what's this?

    That very well could cause a knock...but the more i think about it, it would not stop by pulling the ignition lead. So, never mind!?!

    This is an odd one. Another possibility is carbon in the head combustion chamber. If everything else in the bottom end is tight, then pulling the head would be the next step.
    John

    Most of a 1955 TR2

  9. #89

    Re: Knock knock... what's this?

    My only guess is the little bit of wear that was ok the rod bearings. And I will post my findings when I get the new ones installed. I would like to confirm the passage for oil is clear in the crank, but I don't like the idea of blasting air in there. I am worried it could cause a much worse block as well as leaving a void air in the crank, maybe a block elsewhere? Is there any way to check if there is a block by somehow pushing oil through?
    *1959 TR3A
    *1951 Chevy Fleetline Deluxe
    *1986 GMC Sierra Classic

  10. #90
    Yoda CJD's Avatar
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    Re: Knock knock... what's this?

    By now all the oil is drained from the crank anyway, so adding air is not going to hurt anything. You should see it bubbling out the rear main. You cannot impose a block unless there is already something in there to block it. The oil hole is just a drilling from the rod journal to the rear main journal. .003" bearing clearance is not enough to cause a knock, unless there is no oil reaching the bearing.

    An oil blockage is a long shot. I no longer think it's the bearing. It has to be piston related.
    John

    Most of a 1955 TR2

  11. #91

    Re: Knock knock... what's this?

    Yeah, you got a point...

    do you blow air from the hole in the crank journal?

    What more can I check with the piston with the bottom off? I am going to compression test engine when I get it buttoned back up. Oil pressure was good...
    *1959 TR3A
    *1951 Chevy Fleetline Deluxe
    *1986 GMC Sierra Classic

  12. #92
    Jedi Warrior
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    Re: Knock knock... what's this?

    Have you checked the small end for clearance? Grab the end of the connecting rod and try to move the piston up and down. The PO may have left the small end bush off the No. 4 rod.

    David

  13. #93

    Re: Knock knock... what's this?

    I have. I actually took a video of it, but it's such a frustrating video because I'm just fumbling around in a really tight spot. The only bit of "play" is at the wrist pin from side to side... nothing lateral.
    *1959 TR3A
    *1951 Chevy Fleetline Deluxe
    *1986 GMC Sierra Classic

  14. #94
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    Re: Knock knock... what's this?

    To me, the noise sounds like the double knock from a loose small end bushing. It is especially noticeable when removing and replacing the spark plug wire.
    Berry

  15. #95

    Re: Knock knock... what's this?

    Well, here is the original video: https://youtu.be/xgi8RZ6x6qY
    here is a video from today new bearings in: https://youtu.be/1lS9ftg_1wc

    What do we think?! Out of the woods? What else is going on with this engine?
    *1959 TR3A
    *1951 Chevy Fleetline Deluxe
    *1986 GMC Sierra Classic

  16. #96
    Yoda CJD's Avatar
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    Re: Knock knock... what's this?

    There's no denying it's much better! I still hear a slight knock, but I'd personally wait until it gets more pronounced before digging into it.

    Is the consensus that the old bearing shells were out of tolerance?
    John

    Most of a 1955 TR2

  17. #97

    Re: Knock knock... what's this?

    That's kind of what I'm thinking. I think I'll drive it like this for awhile, if the knock comes back, I will probably end up having to get a rebuild. I think the knock is a two fold knock I am going to replace the manifold gasket next and see how that helps.

    need to set the timing and get the carbs dialed in. I feel like I'm idling very high~950 rpms
    *1959 TR3A
    *1951 Chevy Fleetline Deluxe
    *1986 GMC Sierra Classic

  18. #98
    Jedi Trainee Merlin63Tr4's Avatar
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    Re: Knock knock... what's this?

    It sounds like a typical TR engine with a few miles in it.
    You can still hear the knock, but it is not very noticeable.
    Still wonder why the excess wear on the No.4 bearing shell and not the other three.

    M.
    Merlin the '63 Tr4.... it grows younger !

    "A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools." -- Douglas Noel Adams (1952-2001)

  19. #99

    Re: Knock knock... what's this?

    Quote Originally Posted by Merlin63Tr4 View Post
    It sounds like a typical TR engine with a few miles in it.
    You can still hear the knock, but it is not very noticeable.
    Still wonder why the excess wear on the No.4 bearing shell and not the other three.

    M.
    i bet there was a clog in the oil at some point. With the score marks running from the oil holes on the bearing, it seems like some grit probably worked its way through there.
    *1959 TR3A
    *1951 Chevy Fleetline Deluxe
    *1986 GMC Sierra Classic

  20. #100
    Obi Wan
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    Re: Knock knock... what's this?

    Yeh much better without the spark waking away, I still do not like the hollowness I hear, and yes the problem does not have to be one thing. Maybe bottom end and valve train together. I hear a typical TR3 valve train and==== yes a little== to a lot=== too loose. Have you slid one of the rockers over and felt the bottom of the rocker shaft. you have too loosen up the adjuster with the piston up..

    TR3s chew those shafts up for some reason, but perhaps it is the originals that I have taken out over the years, but what I am saying is the shafts can get very worn deeply and the motor runs fine=== but makes noises and it cannot be fixed without replacing the shaft and usually re-bushing (which I do not recommend) or replacing the rockers. I would seriously think about doing that because it has to be done anyway, does not cost that much and the motor and stuff stays in the car and the access is easy. Wish I was there I would feel more confident about my diagnoses.


    Bottom line is you are a TR3 guy now, so now=== you have to fix it, and yes===== I did see a Rabbit run through here.
    Steve

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