SDPC Tech Tips: Lash Caps, and you!
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- čas přidán 21. 08. 2024
- Nick explains why you need to run lash caps on the titanium intake valves of your LS7, LS9, Gen V LT4, and LT5. We've made posts about this previously, and caution our customers as well when performing any engine work, but sometimes a step is missed, or the lash caps are placed on the wrong valves. Don't let an inexpensive part turn into a $10,000+ mistake.
#SDPC #SDPCRaceshop #TechsualHealing #LS7 #LashCaps
This exact thing happened to me after a local machine shop did my heads and didn’t put them back on and didn’t inform me of these. It caused major damage to the entire engine after the valve stuck open. Knowing how important these are why doesn’t the GM Service manual mention these? I sure wish I had seen this video before re-Assembly!
I got talked into doing a cam swap on a LS7 and just started on it. I need to find out what intake valves he has so I can make sure I dont cost him money. Thanks!
Will grinding or sanding these types of lash caps for looser clearances ruin the structural integrity of them?
Yes, that will decrease the structural integrity of the lash cap. By how much? We're not ones who like to find that out :D
@@Sdpartscenter I started to grind down a test shim and realized that indeed the structural integrity would be bad. I needed more than 0.10mm shaved off. It's too bad not very many companies sell these types of shims in a variety pack. The dealerships seem backed up with orders as well. Thanks for the response.
Are the meant to only install on the intake side of the valve stem tip? Should I use them on the exhaust side as well. Just did a cam swap and I am getting some rocker noise. Any help would be appreciated thanks.
Just the intake side unless you have installed titanium valves on the exhaust side as well. Hope you track down the odd noise!
@@Sdpartscenter thank you. One last question, is it ok to use lock tight inside the lash caps before applying them on the valve stem tip?
Don't they already come on the valves from the factory?
Yes, but when servicing the heads, installing stiffer valve springs, or installing a cam, people have a tendency of forgetting to put them back on, or put them on the wrong valve :(
So what holds em on?
Compression between the valve tip and the rocker arm tip. There's a recessed area on the underside of the cap that fits over the valve tip.
Is that only on titanium valves ?
Correct. This isn't required on the stainless steel valves, and the hardened sodium filled valves. There are titanium valves with hardened steel tip inserts, so not necessary on those.