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#1 |
Registered User
Join Date: Mar 2016
Location: Rogers, MN
Posts: 7
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Inline 6 - 250 Lifter Question
My inline 250 developed a "ticking" sound during idle and speeds below 45MPH. I isolated the sound to piston 5 or 6 and figured it was a bad lifter. I changed out the lifters and adjusted rockers to spec, but sound still persists. Does anyone have any input or suggestions on next steps?
Thanks in advance. |
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#2 |
Six in a row makes it go...
![]() Join Date: Mar 2009
Location: Vacationland: Maine
Posts: 1,346
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Re: Inline 6 - 250 Lifter Question
More than once on straight sixes, the ticking noise I thought was valve train was actually exhaust manifold leaking. A short length of garden hose against my ear with the other end near the engine helped isolate it.
I don't know if this is your issue, but it's what came to mind...
__________________
67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce |
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#3 |
Registered User
Join Date: Mar 2016
Location: Rogers, MN
Posts: 7
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Re: Inline 6 - 250 Lifter Question
I put stethoscope on it and the ticking is definitely coming from the back cylinders. I've been focusing on lifters and didn't even think of an exhaust leak. Would an exhaust leak create a ticking sound in an isolated part of the engine?
Thanks. |
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#4 |
Six in a row makes it go...
![]() Join Date: Mar 2009
Location: Vacationland: Maine
Posts: 1,346
|
Re: Inline 6 - 250 Lifter Question
I've always been amazed at how much an exhaust manifold leak sounds like valve train ticking. I would try the hose trick around the manifolds near the head. At least you could rule that out. Can use an old heater hose. Don't cost much or take much time...
__________________
67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce |
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#5 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,602
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Re: Inline 6 - 250 Lifter Question
It can.
I hope you didn't change all the lifters. If so you stand a good chance of wiping a cam lobe or two. |
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#6 |
Registered User
Join Date: Mar 2016
Location: Rogers, MN
Posts: 7
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Re: Inline 6 - 250 Lifter Question
Changed the back 6 lifters, pistons 4, 5, & 6. Recently changed fuel pump. I'm going to check that out.
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