1.4 Scat Rocker Arm Pitting

VW&MGman · Samba Member Joined: January 06, 2008 Posts: 112

Hi Everyone,

Has anyone every experience pitting on the rocker arm faces, that contact the lash cap on Scat 1.4 rocker arms?

I installed the set of lash caps that came with the Scat 1.4 kit, and after approximately 10 miles of engine break-in, I adjust the valves, and I found one of the lash caps 'concaved' and a few others badly pitted. The rockers were pitted as well.

I'm running DRD L6 heads with their valve springs and chromoly push rods. Clearance was set to 0 loose.

Any thoughts or suggestions?

bugguy1967 · Posted: Mon May 23, 2016 12:33 pm Post subject: Re: 1.4 Scat Rocker Arm Pitting

Aren't SCAT ratio rockers heat treated on their tips? Is the metal a different color there? If not, maybe they skipped treatment.

VW&MGman · Samba Member Joined: January 06, 2008 Posts: 112

The metal is the same color.

mark tucker · Posted: Mon May 23, 2016 1:22 pm Post subject: Re: 1.4 Scat Rocker Arm Pitting

did you use any moly cam lube inbetween the lash cap&the rocker foot? do you have enough oil supply to them? the oe oiling is just a spirt&squirt at best.also is the geo right?

theDrew · Posted: Mon May 23, 2016 1:31 pm Post subject: Re: 1.4 Scat Rocker Arm Pitting

a picture is worth a 1000 words
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VW&MGman · Samba Member Joined: January 06, 2008 Posts: 112

Geometry is correct, and I'm using Valvoline VR1 oil.

I would assume that there is enough oil, as when I take off the valve cover, everything is oily.

I tried capturing a picture of the damage, but is it not coming out clear.

jason · Posted: Mon May 23, 2016 2:14 pm Post subject: Re: 1.4 Scat Rocker Arm Pitting

You check coil bind, max lift and valve to piston clearance?

VW&MGman · Samba Member Joined: January 06, 2008 Posts: 112

Hi Jason,

Yes, coil bind, valve clearance has all been checked at assembly.

modok · Posted: Mon May 23, 2016 4:46 pm Post subject: Re: 1.4 Scat Rocker Arm Pitting

If they show no signs of being heat treated, and have rapid wear in 10 miles...... call Scat and explain the situation.
Screw-ups do happen, I'm sure 75% of the complaints they get are stupid baloney from people that don't know what's going on, but if there is a real problem you should tell them, and they might even give you another set.

VW&MGman · Samba Member Joined: January 06, 2008 Posts: 112

I just called Tom at Scat...he is to look into it.

Let's see what happens.

mark tucker · Posted: Tue May 24, 2016 12:38 pm Post subject: Re: 1.4 Scat Rocker Arm Pitting

you can also do a file test. as for the vr1......so you didnt use moly on them.just because there is oil in the area dosent mean it's getting where it needs to be when it needs to be there.

neil68 · Posted: Tue May 24, 2016 8:50 pm Post subject: Re: 1.4 Scat Rocker Arm Pitting

Here's a photo of my Scat 1.4 rockers for comparison and you can see the flame-hardened tips:

Image may have been reduced in size. Click image to view fullscreen.

_________________
Neil.

Der Kleiner Rennwagens
68 Beetle 2332 cc, 204 WHP
12.5 seconds @ 107 mph
Dynojet Test: https://www.youtube.com/watch?v=M9B_H3eklAo

Howard 111 · Posted: Tue May 24, 2016 9:24 pm Post subject: Re: 1.4 Scat Rocker Arm Pitting

Good photo Neil.
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Turbocharged, Fuel Injected
http://www.thesamba.com/vw/forum/viewtopic.php?t=531270

midtravelmidengine · Posted: Wed May 25, 2016 8:18 am Post subject: Re: 1.4 Scat Rocker Arm Pitting

mark tucker · Posted: Wed May 25, 2016 10:31 am Post subject: Re: 1.4 Scat Rocker Arm Pitting

next question....do they say scat on them like the ones neil posted Shocked

there are many out there that look similar but arnt. I bought a set of the look alikes and found all kinds of shit not right including not heatreeted, tips not square to the shaft&more. I fied them and heatreeted them and have around 35000 miles on them. with out the fix they went about 100 miles.Ive since bought another set , reworked them and they have about 75000 miles.

VW&MGman · Samba Member Joined: January 06, 2008 Posts: 112

Hi Neil,

Yes mine do say SCAT on the rockers and are 'blued' on the ends of the rocker. They look very similar to yours.

I'm thinking that the lash caps are the root cause of this issue. I spoke with SCAT and I'll be sending them the lash caps for them to analyze.

When your rockers are installed and adjusted on your engine, approximately how many threads are exposed on adjusting screw?

Howard 111 · Posted: Wed May 25, 2016 5:29 pm Post subject: Re: 1.4 Scat Rocker Arm Pitting

As long as they are blued on the ends, they should be okay. The blued look means they were flame hardened, a needed process to make them last.
_________________
1973 Karmann Ghia
Turbocharged, Fuel Injected
http://www.thesamba.com/vw/forum/viewtopic.php?t=531270

neil68 · Posted: Wed May 25, 2016 7:09 pm Post subject: Re: 1.4 Scat Rocker Arm Pitting

jason · Posted: Thu May 26, 2016 8:02 pm Post subject: Re: 1.4 Scat Rocker Arm Pitting

I read the Scat lash caps were soft. I read it on here but can't remember where.

neil68 · Posted: Thu May 26, 2016 9:23 pm Post subject: Re: 1.4 Scat Rocker Arm Pitting

I've used a set of Scat lash caps for ~10 years with no issues. Then last week, one broke in half on my first drag race of the season:

_________________
Neil.

Der Kleiner Rennwagens
68 Beetle 2332 cc, 204 WHP
12.5 seconds @ 107 mph
Dynojet Test: https://www.youtube.com/watch?v=M9B_H3eklAo


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