87sierra
Full Access Member
- Joined
- Aug 18, 2012
- Posts
- 172
- Reaction score
- 4
- Location
- Pennsylvania
- First Name
- Paul
- Truck Year
- 1987
- Truck Model
- Sierra 2500
- Engine Size
- 5.7L 350 TBI
Okay its been a while since i have been on here i have replaced my intake manifold gaskets two times and everytime due to oil leaking from them at the back and front of the intake (Valley of Engine) and everytime it stops leaking for two to three weeks than starts leaking again i properly clean both surfaces making sure they are clean of oil and are smooth then apply the right amount of silicone to the surface i believe they recommend a 1/8 on an inch of silicone not sure if that is right then i place the intake down and and thread all bolts in and work from the center out in a circle pattern torque the bolts to the proper spec i have also notice with the intake off that were the egr valve is on the intake that the passage on the head is blocked by a thin layer of what looks like carbon but is as hard as rusty sheet metal. I dont think that is the cause of my leak could a possible bad pcv valve be the cause? just wondering if anyone had any ideas as to why the intake gaskets keep leaking or if there is a different style of gasket that can be used i know there is a style that uses rubber pieces for in the valley or between the intake manifold and the block here is a link to the gasket set i use http://www.napaonline.com/Catalog/C...-Gasket-Set-Intake-/_/R-FPBMS93317_0147289129 i usally use the silicone supplied with the kit unless i have a tube of silicone i get from work
Thank for any help
Thank for any help