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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 11-09-2009, 07:26 PM   #1 (permalink)
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Rocker arm replacement

In previous valve guide posts, some of you mentioned that worn rocker arm assemblies could be the possible culprit to the ticking/tapping noise that is usually associated with worn valve guides.
My rig has this distinct and typical high milage 7.3l ticking noise that is getting worse and I always thought it was valve guides on there way out. However, since there is no noticeable 'chuffing'' sound out the exhaust or intake like there would be with bad guides, could my issue be worn rocker arms?

Im assuming rocker replacement on our idi's is similar to that of any other V-8, or am I mistaken?
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Old 11-09-2009, 10:00 PM   #2 (permalink)
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Pretty much same proceedure, just remember when you remove the parts place them so they will go back on the same valve.... except for the new parts. Check the 2 valve springs per valve for broken external or internal springs..... they cause the ticking too.
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Old 11-09-2009, 10:38 PM   #3 (permalink)
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Oh I was thinking about doing the whole rocker arm assembly. you think I should pull them and just replace the most worn ones?
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Old 11-10-2009, 05:42 PM   #4 (permalink)
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Assembly's are individual to each valve...... You can replace all if you wish... most wear is under the rocker hold down on the rocker arm. Push rods are copper to the top.....
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Old 11-10-2009, 07:46 PM   #5 (permalink)
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Ok so should I pull the rocker assemblies and just replace the worn ones you figure?
The reason I wanted to do them all is so I can do it all in one shot and have the truck back at work asap. but I suppose the whole rocker assembly kit will also be pricey.
These engines have hydraulic lifters..correct?

I don't think im going to jump into this project just yet...gonna figure out how to do this most efficiently.
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Old 11-10-2009, 08:31 PM   #6 (permalink)
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If you have the $$$$$ do them all, I will upload the rocker assy info shortly to my photo link. DONE!!!!!!
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Old 11-10-2009, 10:54 PM   #7 (permalink)
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Great, Thanks! When I do it I think I will do them all. It only makes sense since I don't plan on being under the valve covers again anytime soon
Im going to start shopping around for prices this week!


How can I compare rocker ticking to bad valve guide ticking other than the chuffing sound through the intake and exhaust?
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1981 Honda Trail 110.
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Old 11-10-2009, 11:08 PM   #8 (permalink)
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Drain off a quart of engine oil and add a quart of ATF or Marvel Mystery Oil. Run it like this for a few days to a week without any heavy loads, and the detergent qualities of the ATF/MMO will remove contaminants that can cause lifters to stick.
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Old 11-11-2009, 10:39 PM   #9 (permalink)
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Ive put many treatments of Auto-Rx through it and im not sure MMO would do anything, but I'll give it a try.
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1984 F-250 6.9, T-19, BW1345, BB code injectors, low mileage, manual Beru Glow Plugs, D70 rear end. solid truck.

1985 Toyota Landcruiser BJ60, 5 bearing cam 3B 4cyl diesel, H55F trans. Best rig I have ever owned.

1981 Honda Trail 110.
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Old 11-12-2009, 04:53 PM   #10 (permalink)
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To do the lifters you would need to remove the intake......... if the rocker assy are worn significantly, then the lifters may not recover/expand in length to cover the wear loss. IIRC they only expand max 32 thou. Of course if the lifters have worn the block slide holes then some leakage of oil pressure could be a problem.......

Check the lengths of the push rods and how straight they are on a plate if glass or known flat object.
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Old 11-12-2009, 06:56 PM   #11 (permalink)
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will do! I used to have an old ford pickup with a 400ci under the hood, a lifter sized up after sitting a few months...gummed up with dirty oil... and after firing it up for a few seconds, not knowing of the situation, I couldn't believe the shape the pushrod took!
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1981 Honda Trail 110.
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Old 03-27-2011, 12:41 PM   #12 (permalink)
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Rocker arms on the 87-94 IDI are a cinch to replace. One five piece assembly for each cylinder. Two rockers, two rocker arms, and a clip that holds them together. Two bolts per assembly. About $40-$60 a piece I think.
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