Smoking 360
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Junior User
Joined: Jan 2002
Posts: 79
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Smoking 360
The 360 I had to put in my truck a couple of months ago is smoking when I start it. Everytime I start my truck I get a cloud of white smoke. It also burns quite a bit of oil. As long as I keep oil in it it runs good. I was wondering what is causing it to smoke.
More Turbo
Joined: Jun 2001
Posts: 572
Likes: 1
Smoking 360
I believe Smoking on start-ups is usually a sign of worn valve guides. (someone correct me if i'm wrong) The oilinthe heads leaks past the guides and onto the valve. then when you start it the valve opens and dumps the oil into the chamber
Elder User
Joined: Aug 2001
Posts: 962
Likes: 2
From: Collierville, TN
Smoking 360
Smoking on startup can also be a sign or worn rings. As the engine heats up, the pistons and rings expand and seal up better.
Still, blue smoke is typical of burning oil. White smoke usually means coolant/water. I'd suspect a blown head gasket along with possibly bad rings and/or valve guides.
Still, blue smoke is typical of burning oil. White smoke usually means coolant/water. I'd suspect a blown head gasket along with possibly bad rings and/or valve guides.
Cargo Master
Joined: Jul 2000
Posts: 2,281
Likes: 18
From: Northern California
Smoking 360
Some things to check, PCV system, this helps the rings to seal and helps keep oil from passing the stem seals.
Stem seals, you can actually install new seals without removing the heads with a small rope to hold the valve in place and a tool to remove the springs.
check the amount of oil going to the head, if it floods the head it's probably too much oil and some restrict it with a Holley carb jet under the rocker arm stand.
Check to see if the rocker shafts are not upside down, the oiling holes need to be pointed down. You can remove one of the end rocker arms and look for the oiling hole on the bottom. Some make this mistake when rebuilding the valve train.
A leak down tester or compression test should tell something about the condition of the rings, if it's marginal, either live with oil loss or start looking into a rebuild.
Stem seals, you can actually install new seals without removing the heads with a small rope to hold the valve in place and a tool to remove the springs.
check the amount of oil going to the head, if it floods the head it's probably too much oil and some restrict it with a Holley carb jet under the rocker arm stand.
Check to see if the rocker shafts are not upside down, the oiling holes need to be pointed down. You can remove one of the end rocker arms and look for the oiling hole on the bottom. Some make this mistake when rebuilding the valve train.
A leak down tester or compression test should tell something about the condition of the rings, if it's marginal, either live with oil loss or start looking into a rebuild.
Elder User
Joined: Oct 1999
Posts: 917
Likes: 3
From: Kelseyville USA
Smoking 360
A bad intake manifold gasket will allow oil to be sucked into the intake runners.... Are all the spark plugs showing a sign of burning oil? are they wet?
__JOHN__ô¿õ
1972 F-250
ICQ# 6030753
__JOHN__ô¿õ
1972 F-250
ICQ# 6030753
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Junior User
Joined: Jan 2002
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Smoking 360
[updated:LAST EDITED ON 09-Mar-02 AT 09:01 PM (EST)]The spark plugs do show signs of burning oil. The piston rings should not be worn because they were replaced not long ago. If the crappy mechanic I used would have called me before he replaced the rings I would have had him check all the valves but he didn't so I don't know what they look like. Since it sounds like it is a pretty big job to fix this I probably won't since I am selling the truck. I was just hoping there was a simple way to get it to quit smoking. And the smoke is actually more of a blue or gray than white.
Laughing Gas
Joined: Oct 1999
Posts: 1,188
Likes: 0
From: yes
Smoking 360
[updated:LAST EDITED ON 10-Mar-02 AT 11:19 AM (EST)]
You could try swapping in some thicker oil, like 20w50, I noticed changing from 10w30 to 15w40 stopped a smoking outside of my right pipe (dual exhaust) but it's still better to let the new buyer know the engine will need the stem seals replaced and that it's a fairly easy but time consuming job
The spark plugs do show signs of burning oil. The piston
rings should not be worn because they were replaced not long
ago. If the crappy mechanic I used would have called me
before he replaced the rings I would have had him check all
the valves but he didn't so I don't know what they look
like. Since it sounds like it is a pretty big job to fix
this I probably won't since I am selling the truck. I was
just hoping there was a simple way to get it to quit
smoking. And the smoke is actually more of a blue or gray
than white.
rings should not be worn because they were replaced not long
ago. If the crappy mechanic I used would have called me
before he replaced the rings I would have had him check all
the valves but he didn't so I don't know what they look
like. Since it sounds like it is a pretty big job to fix
this I probably won't since I am selling the truck. I was
just hoping there was a simple way to get it to quit
smoking. And the smoke is actually more of a blue or gray
than white.
You could try swapping in some thicker oil, like 20w50, I noticed changing from 10w30 to 15w40 stopped a smoking outside of my right pipe (dual exhaust) but it's still better to let the new buyer know the engine will need the stem seals replaced and that it's a fairly easy but time consuming job
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