Worn valve guide... I need some moreconvincing!! lend me your thoughts... - Diesel Forum - TheDieselStop.com
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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 10-07-2007, 06:51 PM   #1 (permalink)
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Worn valve guide... I need some moreconvincing!! lend me your thoughts...

The number 5 exhaust valve is the suspect one. I can push down on the spring with my hand. I can not do that with any of the other springs.I can also twist the spring around in circles, which i can not do with any of the others. The question is, Could I just have a bad spring that is causing similar symptoms as a worn valve guide.

Please help me [img]/forums/images/%%GRAEMLIN_URL%%/cry.gif[/img]
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Old 10-07-2007, 07:00 PM   #2 (permalink)
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Re: Worn valve guide... I need some moreconvincing!! lend me your thoughts...

A worn valve guide would wiggle excessively when the stem is pushed down about 3/8"....... the inner spring may be broken or the outer as mine was. Only one curl but enough to allow bad compression......and popping out the exhust.
Check the link below..
http://www.thedieselstop.com/content...r%207.3L%20IDI
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Old 10-07-2007, 07:29 PM   #3 (permalink)
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Re: Worn valve guide... I need some moreconvincing!! lend me your thoughts...

As cdnsarguy said the spring is weak and could cause the problem but there may also be a couple of other things going on. First I would make sure you have the piston at TDC on that cylinder when you are doing anything right now since pushing down on the spring/retainer could cause the keepers to pop out and the valve would then fall into the cylinder. What did the inside of the valve cover look like especially above that valve? What does the area around the valve look like compared to the others at the rear of the head? If you pull/push sideways on the top of the valve spring does the tip of the valve move sidways at all?
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Old 10-07-2007, 07:46 PM   #4 (permalink)
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Re: Worn valve guide... I need some moreconvincing!! lend me your thoughts...

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: suv7734</div><div class="ubbcode-body"> What did the inside of the valve cover look like especially above that valve? </div></div>

Clean, oily

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: suv7734</div><div class="ubbcode-body">What does the area around the valve look like compared to the others at the rear of the head?</div></div>

allot of crud specific to that area


<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: suv7734</div><div class="ubbcode-body"> If you pull/push sideways on the top of the valve spring does the tip of the valve move sidways at all? </div></div>

yes.

...........

I suppose I could have the worn guide AND a broken/ weak spring..

thanks for the info
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ZF-5 speed 4 wheel drive
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D load tires &lt;img src="/ubbthreads/images/graemlins/frown.gif" alt="" /&gt;
super cab
18x,xxx miles.
Purchased 9-22-06
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Old 10-07-2007, 07:55 PM   #5 (permalink)
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Re: Worn valve guide... I need some moreconvincing!! lend me your thoughts...

I have seen this before and the guide is completely shot. When you are running it the cam pushes the valve open and the exhaust is not only going out the manifold it is coming up the valve stem and into the crankcase (is your rear main leaking?). That is where that 'grainy' crud is coming from, it's oil that has been burnt by the hot exhaust. With that much guide clearance it will most likely be allowing oil into the cylinder which will burn during combustion. Depending on the amount of oil the cylinder temps can go up significantly since oil has a higher BTU rating than diesel fuel. The spring may or may not be broken but the one I know of had been run so long and hard it appeared the temper was gone from the spring due to the excessive heat (may or may not be the case).
Sorry my friend but the only thing that I can see from this information is the head(s) need to come off. I'm sorry I have not been following any previous threads, how has this thing been running lately, just a miss/tick or other symptoms?
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Old 10-07-2007, 08:03 PM   #6 (permalink)
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Re: Worn valve guide... I need some moreconvincing!! lend me your thoughts...

Rear main?
A slight tick, a slight woof out the exhuast. The truck was running GREAT everything worked and ran smooth as silk. The tick became louder so i shut her down and came here and took off the valve covers.

The major dilemma is, i was trying to sell it because I am moving cross the country and cant afford to take the truck. Now i dont know what to do, sell a truck with a crappy engine or fix it and sell it. Taking the heads off is out of my league while living in an apt complex...

thanks again
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1993 Ford IDI 7.3L
F-250
ZF-5 speed 4 wheel drive
Class 5 hitch
D load tires &lt;img src="/ubbthreads/images/graemlins/frown.gif" alt="" /&gt;
super cab
18x,xxx miles.
Purchased 9-22-06
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Old 10-09-2007, 08:29 PM   #7 (permalink)
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Re: Worn valve guide... I need some moreconvincing!! lend me your thoughts...

You can pull that valve spring without too much fuss with the head on. Make sure the piston is at tdc and get a valve spring compressor on it and pop that spring out and see if it's broken.
soon after I first got my truck, I went to replace the valve stem seals and found one or two broken springs. A new set ran about $40. Easily replaced with the heads on with the right tools.

----------Robert
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Old 10-13-2007, 03:16 AM   #8 (permalink)
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Re: Worn valve guide... I need some moreconvincing!! lend me your thoughts...

This is very common on those motors - most likely the guide is totally worn out(I have seen them up to 1/4" movement), and it's a PITA to fix.
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