Previous Thread
Next Thread
Print Thread
Cleaning inlet valves on car with inlet manifold off. #2516077
07/01/18 10:09 PM
07/01/18 10:09 PM
Joined: Aug 2017
Posts: 32
New Zealand
R
RayR Offline OP
member
RayR  Offline OP
member
R

Joined: Aug 2017
Posts: 32
New Zealand

I am considering mechanically cleaning my inlet valves in the head with the intake manifold off - any thoughts? guidance?

Story, my car had PCV issues (as in some other threads) which have now been solved with a proper filtered catch can in the PCV line. Unfortunately the inlet valves got quite gunked before I understood the problem but decided to leave as it was still running OK. Now I have an intake gasket failure so have the manifold off and can access the back of the valves. I was thinking of using a brass scraper to remove the worst of the gunk, with the valve closed!! and vacuum out, then finish with a spray valve cleaner once the engine is running again.

Comments?

Re: Cleaning inlet valves on car with inlet manifold off. [Re: RayR] #2516086
07/01/18 10:20 PM
07/01/18 10:20 PM
Joined: Jan 2003
Posts: 8,639
Buford, GA
I_bleed_MOPAR Offline
master
I_bleed_MOPAR  Offline
master

Joined: Jan 2003
Posts: 8,639
Buford, GA
I would say no. Too much chance of missing a chunk. shocked
There are products to do this (SeaFoam comes to mind). My Dad and other older mechanics would dribble ATF or water through the carb after raising the idle speed considerably.


Tim


'71 Charger 383/727
'17 Challenger SXT (Wifeys car wink )
Re: Cleaning inlet valves on car with inlet manifold off. [Re: RayR] #2516133
07/01/18 11:05 PM
07/01/18 11:05 PM
Joined: Aug 2017
Posts: 32
New Zealand
R
RayR Offline OP
member
RayR  Offline OP
member
R

Joined: Aug 2017
Posts: 32
New Zealand
Thanks Tim, I had thought along those lines but then I got to thinking, isn't there more chance of putting a chunk through the cylinder with the water/ATF/Seafoam method? my understanding was these methods don't dissolve the gunk they separate it from the valve? or am I missing something?

Ray

Re: Cleaning inlet valves on car with inlet manifold off. [Re: RayR] #2516183
07/02/18 12:31 AM
07/02/18 12:31 AM
Joined: Jan 2003
Posts: 1,870
s. e. pa.
C
calrobb2000 Offline
top fuel
calrobb2000  Offline
top fuel
C

Joined: Jan 2003
Posts: 1,870
s. e. pa.
hi

scrap and vav with valves closed you will get anything big enough to cause any problems.

tape a smaller hose to vac nozzle if needed to get in there !

Re: Cleaning inlet valves on car with inlet manifold off. [Re: RayR] #2516250
07/02/18 05:30 AM
07/02/18 05:30 AM
Joined: Aug 2017
Posts: 32
New Zealand
R
RayR Offline OP
member
RayR  Offline OP
member
R

Joined: Aug 2017
Posts: 32
New Zealand
Thanks, I think I will be giving it a go.

Re: Cleaning inlet valves on car with inlet manifold off. [Re: RayR] #2517364
07/04/18 11:18 AM
07/04/18 11:18 AM
Joined: Jan 2003
Posts: 338
Montreal Quebec
STROKIE Offline
enthusiast
STROKIE  Offline
enthusiast

Joined: Jan 2003
Posts: 338
Montreal Quebec

Re: Cleaning inlet valves on car with inlet manifold off. [Re: STROKIE] #2517444
07/04/18 01:30 PM
07/04/18 01:30 PM
Joined: Jan 2003
Posts: 1,367
Houston,Tx.
L
Lee446 Offline
pro stock
Lee446  Offline
pro stock
L

Joined: Jan 2003
Posts: 1,367
Houston,Tx.
Seafoam sprayed on the valves is probably good, it seems like several years ago, I read an article that said Chevron Techron was good at removing buildup. You can buy the Techron additive at the parts house and give it a try. If it works good mixed in the fuel, it might work well sprayed directly on.

Last edited by Lee446; 07/04/18 01:31 PM.
Re: Cleaning inlet valves on car with inlet manifold off. [Re: Lee446] #2520142
07/10/18 07:21 PM
07/10/18 07:21 PM
Joined: Jan 2003
Posts: 16,375
D
dogdays Offline
I Live Here
dogdays  Offline
I Live Here
D

Joined: Jan 2003
Posts: 16,375
The true Techron concentrate is the stuff. I say scrape it and run it through the engine. it's not like we're forming diamonds on the backsides of the intake valves!
When BMW was having problems with coking on the backs of the intake valves they blasted with crushed walnut shells. The idea being that walnut shells do no damage and will burn. Some years ago I bought a pair of heads for a TBI chevy 350 and took them apart. There was nearly 1/4" of spongy carbon cake on the back of each intake valve. I seem to remember it coming off easily.

Of course if you want to scrape with one hand and run the vacuum cleaner with the other hand that will work too.

R.







Powered by UBB.threads™ PHP Forum Software 7.7.1