| Author |
Message |
Ovally
Samba Member
Joined: June 14, 2014
Posts: 476
Location: Belgium
|
 Posted: Wed Oct 26, 2016 1:53 am Post subject: Clogged heat riser question. |
 |
|
Hi all,
A friend of mine noticed that the oil level is above the top mark of the dipstick.
1200 D motor, fuel pump and pressure are OK.
Carburetor adjustment and fuel level in the float chamber are OK.
Can a clogged heat riser (intake manifold) be the cause of gas in the oil?
Thanks
Last edited by Ovally on Wed Oct 26, 2016 6:33 am; edited 2 times in total |
|
| Back to top |
|
 |
mukluk
Samba Member
Joined: October 18, 2012
Posts: 7028
Location: Clyde, TX
|
| Posted: Wed Oct 26, 2016 2:17 am Post subject: Re: Clogged heat riser question. |
|
|
Theoretically, I'd say it's possible. A clogged heat riser can lead to the fuel condensing as it passes down the intake to the cylinders, where the resulting overly rich mixture can wash the cylinder walls down and get past the rings. The effect would be quite similar to the choke sticking on.
_________________
1960 Ragtop w/Semaphores "Inga" |
|
| Back to top |
|
|
Ovally
Samba Member
Joined: June 14, 2014
Posts: 476
Location: Belgium
|
| Posted: Wed Oct 26, 2016 6:29 am Post subject: Re: Clogged heat riser question. |
|
|
Thanks, yes I also thought it was possible.
However, the engine runs well, the spark plugs look good and no freezing of the carburetor so far.
Maybe someone else had the same problem before I take the inlet manifold of the engine to clean it.
Regards.
Last edited by Ovally on Wed Oct 26, 2016 6:49 am; edited 1 time in total |
|
| Back to top |
|
|
catahoula lou
Samba Member
Joined: August 30, 2008
Posts: 594
Location: south of Silver Springs, NV
|
| Posted: Wed Oct 26, 2016 6:49 am Post subject: Re: Clogged heat riser question. |
|
|
In case you end up having to unclog your heat riser, here is my technique:
http://www.thesamba.com/vw/forum/viewtopic.php?t=666181&highlight=
Best,
Thom
_________________
1 great wife
2 Catahoula Leopard Dogs (Mahogany Star and Spartan) - RIP Lucy, Braveheart, & Dusty!
1 1959 mango green Ragtop Bug (the "Mango")
1 1958 pantina red Lowlight Ghia (the "Chili Pepper")
Still looking for:
(1) My Dad's 1955 356 (he raced it amateur-class at Riverside and other courses during 1950s),
(2) My parent's black 1955 hardtop bug (CA license plate FWC 201 or FWG 201), and
(3) My parent's agave green 1957 ragtop bug (CA license plate LFK 734). |
|
| Back to top |
|
|
bluebus86
Banned
Joined: September 02, 2010
Posts: 11075
|
| Posted: Wed Oct 26, 2016 8:01 am Post subject: Re: Clogged heat riser question. |
|
|
| mukluk wrote: |
| Theoretically, I'd say it's possible. A clogged heat riser can lead to the fuel condensing as it passes down the intake to the cylinders, where the resulting overly rich mixture can wash the cylinder walls down and get past the rings. The effect would be quite similar to the choke sticking on. |
if you got fuel in the oil, it should smell of gas.
sources of fuel could be a leaky fuel pump, or rich running. check them items if you got fuel in the oil.
my riaser was clogged for years, never had fuel in the oil.
_________________
Help Prevent VW Engine Fires, see this link.....Engine safety wire information
Stop introducing dirt into your oil when adjusting valves ... https://www.thesamba.com/vw/forum/viewtopic.php?t=683022 |
|
| Back to top |
|
|
Ovally
Samba Member
Joined: June 14, 2014
Posts: 476
Location: Belgium
|
| Posted: Wed Oct 26, 2016 8:10 am Post subject: Re: Clogged heat riser question. |
|
|
Thanks, Thom for the link.
Meanwhile, we drove 25 km and checked if there was gasoline in the oil.
We took the oil dipstick several times out and with a lighter we don't see anything burn or crackle but I don't know if that's a reliable method to determine whether there is fuel in the oil or not.
Regards, Armand |
|
| Back to top |
|
|
catahoula lou
Samba Member
Joined: August 30, 2008
Posts: 594
Location: south of Silver Springs, NV
|
| Posted: Wed Oct 26, 2016 11:14 am Post subject: Re: Clogged heat riser question. |
|
|
Ovally:
You're welcome. I've also heard that a fuel pump leaking from the bottom could dump fuel into the case...
Best,
Thom
_________________
1 great wife
2 Catahoula Leopard Dogs (Mahogany Star and Spartan) - RIP Lucy, Braveheart, & Dusty!
1 1959 mango green Ragtop Bug (the "Mango")
1 1958 pantina red Lowlight Ghia (the "Chili Pepper")
Still looking for:
(1) My Dad's 1955 356 (he raced it amateur-class at Riverside and other courses during 1950s),
(2) My parent's black 1955 hardtop bug (CA license plate FWC 201 or FWG 201), and
(3) My parent's agave green 1957 ragtop bug (CA license plate LFK 734). |
|
| Back to top |
|
|
Ovally
Samba Member
Joined: June 14, 2014
Posts: 476
Location: Belgium
|
| Posted: Wed Oct 26, 2016 11:22 pm Post subject: Re: Clogged heat riser question. |
|
|
Thom : " I've also heard that a fuel pump leaking from the bottom could dump fuel into the case... "
Yes, I know but the fuel pump is not leaking.We took in off and all the grease is still there in the bottom of the pump.
Regards, Armand |
|
| Back to top |
|
|
Ovally
Samba Member
Joined: June 14, 2014
Posts: 476
Location: Belgium
|
| Posted: Wed Oct 26, 2016 11:28 pm Post subject: Re: Clogged heat riser question. |
|
|
Bluebuss86 wrote : "my riaser was clogged for years, never had fuel in the oil."
So it is not possible that a clogged heat riser can be the cause of fuel in the oil.
Regards, Armand |
|
| Back to top |
|
|
bluebus86
Banned
Joined: September 02, 2010
Posts: 11075
|
| Posted: Thu Oct 27, 2016 8:57 am Post subject: Re: Clogged heat riser question. |
|
|
| Ovally wrote: |
Thanks, Thom for the link.
Meanwhile, we drove 25 km and checked if there was gasoline in the oil.
We took the oil dipstick several times out and with a lighter we don't see anything burn or crackle but I don't know if that's a reliable method to determine whether there is fuel in the oil or not.
Regards, Armand |
the odor threshold for gasoline is low. do the smell test. the crackle test is a new one to me.
_________________
Help Prevent VW Engine Fires, see this link.....Engine safety wire information
Stop introducing dirt into your oil when adjusting valves ... https://www.thesamba.com/vw/forum/viewtopic.php?t=683022 |
|
| Back to top |
|
|
bluebus86
Banned
Joined: September 02, 2010
Posts: 11075
|
| Posted: Thu Oct 27, 2016 9:00 am Post subject: Re: Clogged heat riser question. |
|
|
i bought a 58 bug that had a leaky float valve, it flooded the crank case with about a gallon of gasoline while the car sat unused. check the carb float valve, float level. also make sure you are not running realy rich.
good luck
_________________
Help Prevent VW Engine Fires, see this link.....Engine safety wire information
Stop introducing dirt into your oil when adjusting valves ... https://www.thesamba.com/vw/forum/viewtopic.php?t=683022 |
|
| Back to top |
|
|
|
