dreaded vavle issue - Diesel Forum

DSBlack · 10-10-2005, 11:02 AM

Man, I knew I should not have said anything about how good my truck was running! yesterday I started to get a tick from the engine, and the dreaded woof woof out the tail pipe.
So...
What do I need to buy for the compression test to find the cyl. that is the issue, or can I do it without?
The engine is 2.5 years old, and has not given me any sorrow in all the towing she has done.

I do not think it is an injector, because of the woof out the tail pipe.

What is the best possibility? and the worst? this is a DAS engine with the upgraded valve guides etc. I am thinking after 2.5 years, and the 35K miles that the valve is probably ok? and it is spring or lifter? any help or ideas on where to go would be great!

Just when I thought that I had it all under controll. I think it has been watching me work on the oil conversion for my mercedes and is just a little jealous! [img]/ubbthreads/images/graemlins/rolleyes.gif[/img]

Thanks
Doug

cdnsarguy · 10-10-2005, 11:33 AM

I have a compession tester just like this web page lists and am more than satisfied. They are also much cheaper too.

EDIT there are 3 adapters which only two will work one is loong and the other is short, the other is for VW and Benz I think.

tim94f250 · 10-10-2005, 05:16 PM

That's a great price! I just paid $160. for a comp. tester. Although it has adapters for many different makes and models of diesel engines. But that doesn't do anything for me. All I need is the adapter for our engines.

DSBlack · 10-14-2005, 06:01 PM

I have been thinking about this, and need some suggestions. I have not gotten a gauge yet. But this is a woof at the exhaust and a loud tick noise in the engine. It started all at once.

Where do I begin?

Ideas on root cuase [img]/ubbthreads/images/graemlins/shrug.gif[/img]

Garbage_Mechanic · 10-14-2005, 07:19 PM

Look into the tick noise. It's probably valvetrain, maybe loose or worn rocker. If it is it can cause the woof woof.

ziggster40 · 10-15-2005, 01:04 PM

Doug

Real sorry to hear this bud.

Can you identify approximately where in the engine the tick noise is coming from? Try using a long screwdriver and cupping your hand over the handle to your ear while you touch the other end to different things(injectors/valve covers etc) to locate the noise.

Have you tried calling Paul at DAS?

I'm a little worried 'cause I'm just about to button up the final touches on my rebuilt 6.9 with the updated heads etc....(sigh)

I'll be anxiously wanting to hear about what you find...

Zigg [img]/ubbthreads/images/graemlins/smile.gif[/img]

DSBlack · 10-15-2005, 04:36 PM

Thanks Zig.
I have not called Paul. So mad at the thing that it is being punished by sitting and waiting on me.

I think that the real issue is that the old girl got upset that I have spent all the time on my 85 MB converting it to SVO. Truck always seems to know when I need it.

I am hoping to locate the noise this week. I am looking for ideas on where to start.

I should not complain, a few years and many miles working the h@#$% out of it and a few over heating times. and at least it is not camping season. [img]/ubbthreads/images/graemlins/biggrin.gif[/img]

The tick started slow, so I thought I had an injector issue. Then just came to life when running the truck around empty. Still may be seperate issues. [img]/ubbthreads/images/graemlins/shrug.gif[/img]

I have not ordered the compression tester. So I will start with the fitting on the injectors and see if they are related. maybe the tic is injector and the woof is a weak lifter? I can hope for the best.

Can I do an oil change and run some differant oil or something to try and clean out the lifter to see if it is the issue before tearing into it? Or if that is it, is it just the begining of failure?

Next NW rally in WA or OR I will try and be there
You guys are great!

Thanks
Doug

cdnsarguy · 10-15-2005, 08:09 PM

DS......... I had the same thing if you remember, it was a broken valve spring that you would not have seen without disassembly of that particular valve spring assy. It was broken at the base of the spring.

DSBlack · 10-16-2005, 12:59 AM

So if it is a broken spring, can I go to top in the cylinder, pressurize with air and change the spring? or do I have to do a complete disassembly?

Got to get into it this week

ziggster40 · 10-16-2005, 01:47 AM

Doug

There are tools that you can get to remove the valve clips/springs from on top without having to remove anything more than the valve cover. I believe you have to have that cylinder to TDC, and then somehow prevent the engine from turning over. There's only a few thousands clearance between the piston and the valve, so if it can't turn, the valve can't drop in. You've got to figure which one though first.

I have been thinking about this a bit. Rarely occasionally, I get a serious woofing out the intake on my truck. It lasts only till I see oil pressure on the gauge, and then abrubtly goes away. I'm assuming it's a lifter that's weak, and drains down while the truck sits, and it only happens when the engine stops with that valve open.

So, I'm thinking if it's always exhaust, then you may have a bad exhaust lifter that's not holding pressure. You have to remove the injection pump, intake manifold, and valley pan to get at the lifters, but it can be done in an afternoon.

I was looking at the DAS site today, and on the bronze and silver engines, they only replace valve springs and lifters as necessary. New guides/seals/keepers always. I'd be very suprised if you've worn out a valve guide enough to cause a problem with such low mileage.

Zigg [img]/ubbthreads/images/graemlins/smile.gif[/img]

lww · 10-16-2005, 10:44 AM

If you do go after a spring swap with the head in place, removal with affected piston @ TDC is as simple as spanking a deep socket with your hammer while it's held firmly over the retainer (don't want to loose keepers). The overhead spring compressor tool works quite easily to put the new spring back in.

DSBlack · 10-16-2005, 09:27 PM

I will call and talk with Paul, but I bought the Gold engine as a complete drop in.
So the next thing to do is get it under the tarp and take a look.
Loveley rainy season has begun.

Always the exhaust, and it never goes away like you have described
Zig.

I am hoping nothing serious, but I will not find out untill I start looking inside I guess.

thanks again.
Doug

cdnsarguy · 10-16-2005, 10:30 PM

I'm really interested in your reply and assistance from DAS so please keep us informed. What was the warranty on your engine and is it up yet.

DSBlack · 10-17-2005, 11:46 AM

Are they no longer a sponsor on this site? Just went for the quick link and it does not list them.
I will keep you updated.

Thanks again.
Doug

ziggster40 · 10-17-2005, 01:51 PM

[ QUOTE ]
What was the warranty on your engine

[/ QUOTE ]

Looks like 1 year. 2 year limited for extra $750Can.

Also, even on the Gold engine, it looks like springs/keepers are replaced "as necessary".

..Heres's... the page for their "gold" engine...

Hmmm, I got the heads for my "new" engine from them. I was under the impression that the springs/keepers were all "new". I'll go down to the shop today and have a look at it, see if I can see anything...

I may be picking up my "new"(93 F350,CC,E4OD,Fact/turbo with knockin' 7.3-$4,000) truck today, so I'll be wanting to put the engine in pretty soon...(sigh)

Let us know what Paul has to say there Doug...

Zigg [img]/ubbthreads/images/graemlins/smile.gif[/img]