37.1 pounds of boost

leadfoot

leadfoot

Member
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: 37.1 pounds of boost

2" taller than stock eh? That's a damn good find! That will give the rockers some space!!

Almsot worth buying them - RPM's are $400 - nice but pricey!
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: 37.1 pounds of boost

OK, so I'm going to look at push rods in depth on Monday but for now I have 18in vacuum and 50 psi oil pressure at startup settling to around 17in 37.5 psi at idle after spirited driving (415 cam). I've done 120 miles or so since "The Event" so at what point should I expect to see bearings breaking down if they haven't already begun to? I would expect a drop in oil pressure at the same time.

I'll cut the filter on Monday too.

The tapping noise comes and goes but for now the truck runs extremely well. I took Mike and Keith out for some runs and we had some good launches. Went through a quarter of a tank :tup:

I am starting to believe that I may just have rod/lifter issues and was lucky the deto wasn't prolonged.

Now that I have typed this I'll have 10pis today :D
 
1madgumby

1madgumby

New member
Re: 37.1 pounds of boost

I would not drive it, you could be eating the bearings & not know it right now. just wait to see the problum before you drive it any more.just my .02

Quickstop [UK] said:
OK, so I'm going to look at push rods in depth on Monday but for now I have 18in vacuum and 50 psi oil pressure at startup settling to around 17in 37.5 psi at idle after spirited driving (415 cam). I've done 120 miles or so since "The Event" so at what point should I expect to see bearings breaking down if they haven't already begun to? I would expect a drop in oil pressure at the same time.

I'll cut the filter on Monday too.

The tapping noise comes and goes but for now the truck runs extremely well. I took Mike and Keith out for some runs and we had some good launches. Went through a quarter of a tank :tup:

I am starting to believe that I may just have rod/lifter issues and was lucky the deto wasn't prolonged.

Now that I have typed this I'll have 10pis today :D
Click to expand...
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: 37.1 pounds of boost

Unfortunately it's my DD but I'll avoid travelling too far on it. I'll cut the filter asap. Where can I pick up a filter cutter?
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: 37.1 pounds of boost

Update -

checked all the push rods and lifters. There was some wear on 3 rockers where the self guiding rockers were hitting the spring cup rather than seating on the valve stem. Pics to follow.

All push rods were straight so we reinstalled them all and the noise was still there. So what next?

I kind of feel like I should be looking at the lifters now.

The tapping noise is prevalent at really low RPM like when the motor bogs down from D to P occasionally.

Still have 18" vaccum and 37 psi idle warm, 55 psi idle start up, 50 psi freeway.
 
dgoodhue

dgoodhue

BuSTeD 4.3
Re: 37.1 pounds of boost

DaveP said:
Why not adjust the rockers correctly with the engine not running? Engine assembly plants have done it on millions and millions of engines. The vast majority of engine builders and professional mechanics do it.

Why can't you obtain the same results? Adjusting rockers with the engine running makes a mess. Where is the advantage? You're going to be distracted by the mess, and therefore be in a hurry. If you run the nut down too quickly on a running engine, the valve will contact the piston on a high-lift camshaft.
Click to expand...

Sorry to revive an 'old' deleted post, I agree in most cases adjusting the valves is not needed with the engine running. However he is trying to track down a noise that he suspects could be a lifter. I would think their could be an advantage to adjusting the rockers with the engine running, he might be able to notice a rocker or two that sounds funny and or seems off.

Anyway I was able to adjust my rockers on my stock engine with the engine running. (I was going through everything trying to eliminate knock retard). I warmed the engine up (and oil) then remove one valve cover at a time. I used a 4" peice of cardboard along the outside edge of the heads to keep oil from splashing out. Only #2 really had any significant oil coming out of it. I didn't spill one drop of oil.

One thing to think about is if you have a high volume oil pump the amount of oil maybe very different from my results.
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: 37.1 pounds of boost

We tried hot lash but decided that we couldn't distinguish any noise from any other so Big Mike did them the regular way with the engine off.

DaveP - you make a very good point. My only guess as to why someone would do hot lash is that the factory have a machine that torques up the bolts to a preset amount using the auto assembly. I can't imagine that it is done by hand.

So.... on to the next issue.

Before I take the lower intake off to investigate where the tapping is coming from, is there anything else I can do to isolate this? It is double the frequency of the injector ticking.

Again: 18" vacuum at idle, 55 psi start up, 50 freeway and 37.5 psi hot idle. Truck make tonnes of power so I don't think a leakdown is going to tell me anything.

I am leaning on lifters. Any other ideas? Could a pin have come loose and be tapping? I wish I could make a video.. maybe on my ipod.....
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: 37.1 pounds of boost

IMG_1331.jpg


IMG_1330.jpg


IMG_1329.jpg


IMG_1328.jpg


What do you guys think? Looks like the valves are too short for the rockers to work properly. I got these preassembled from RPM.
 
qbnkiller

qbnkiller

Conflaguration Specialist
Re: 37.1 pounds of boost

Quickstop [UK] said:
We tried hot lash but decided that we couldn't distinguish any noise from any other so Big Mike did them the regular way with the engine off.

DaveP - you make a very good point. My only guess as to why someone would do hot lash is that the factory have a machine that torques up the bolts to a preset amount using the auto assembly. I can't imagine that it is done by hand.

So.... on to the next issue.

Before I take the lower intake off to investigate where the tapping is coming from, is there anything else I can do to isolate this? It is double the frequency of the injector ticking.

Again: 18" vacuum at idle, 55 psi start up, 50 freeway and 37.5 psi hot idle. Truck make tonnes of power so I don't think a leakdown is going to tell me anything.

I am leaning on lifters. Any other ideas? Could a pin have come loose and be tapping? I wish I could make a video.. maybe on my ipod.....
Click to expand...

Setting valve lash is no real big deal if you know how to do it properly. You need to be sure you are on the heel of the cam for the valve you are working with. Adjust the exhaust valve as the intake rocker is 0.200" from the top (bottom coming up), then adjust the intake valve as the exhaust rocker is 0.200" moving down (top moving down).
 
UK-Ty

UK-Ty

Ty Crazy
Re: 37.1 pounds of boost

Have you had it on DataMaster since it happened ? i was just wondering if it was being picked up by the knock sensor, im trying to judge the noise without hearing it so its a bit hard. I'm a bit at a loss looking at your rockers, but with those wear marks they aint working well. Is this the problem? or is it just part of the problem. Dude this sucks as i would love to help and start pulling that thing apart to find the problem but i dont think Julie would be cool for me to come over to help.:( Damn women.

If it help its 3.10am over here and im still drinking and im guessing you will feel a lot better than me in the morning:lol:
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: 37.1 pounds of boost

DaveP said:
You're misdiagnosing what the source of the noises are. If the objectionable noise is 2X the frequency of a 'normal' noise, I suspect you're hearing piston or piston-pin noise on every stroke, compared to rocker noise, that occurs every-other stroke.

BTW, better fix that rocker to retainer clearance problem. Good way to drop a valve. The rocker is pushing on the retainer which loosens the keeper in the grooves in the stem.
Click to expand...

How can I confirm the former and how do I achieve the latter? Thanks Dave.

Stupid awesome trucks...

Rob - I'll be back in the UK in Feb... ;) Have one for me! PM me your number and I'll give you a bell. I've lost it again.
 
T

turboj91

New member
Re: 37.1 pounds of boost

Kinda of non related, but have you cut open an oil filter? I'm wondering where the former rocker material went and ended up?
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: 37.1 pounds of boost

Not yet - good reminder! They're aluminium so nice and soft. Can I grind them down to make them contact properly?
 
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