You are here:

Dodge Repair/oil leak in cylinder

Advertisement


Question
04 caravan 120,000 miles has oil on spark plug tip in cylinder 3.8 engine. what are the possible causes.

Answer
Hi Don,
It could be due to oil leaking around one of the valve stems, or to worn piston rings, or to a head gasket leak next to that cylinder. The first thing to check would be the compression of that cylinder and compare it to another. It should be around 100 psi at least. Are you also loosing coolant (excessive white smoke from the tailpipe when starting from cold)? If so that would point to a head gasket leak. Otherwise I would suspect oil leaking around a valve stem or the piston rings.
You can check the rings by adding a teaspoon of oil to the cylinder and then rechecking the compression. If it goes up noticeably that would suggest bad rings. Otherwise, then valve stem seal would be the likely cause.

Roland

Dodge Repair

All Answers


Answers by Expert:


Ask Experts

Volunteer


Roland Finston

Expertise

Get a Free Fast answer to your repair question about a Chrysler/Dodge/Plymouth car, minivan, SUV, or truck. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty. This free troubleshoot advice forum helps you diagnose faults, minimize repair costs or do-it-yourself.

I answer questions seven days a week and respond to you in about 30 minutes. "Maxed Out" means I am answering another question or asleep overnight so try again later.

I have do-it-yourself experience (50+ years) and a library of 100 1982-2012 Chrysler factory shop manuals and 20 multi-manual Chrysler Corp. CD's.

I was voted "Top expert" from 2010-2015 here at AllExperts, and have answered 20,000+ questions.

Experience

Five decades as a 'do-it-yourselfer' on domestic and imported cars

Organizations
Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)

Education/Credentials
Degrees in Physics/bruised knuckles.

Awards and Honors
"Top expert" of 2010, 2011, 2012, 2013, 2014, and 2015 here at Allexperts. Quickest "average response time" at Allexperts (currently no. 1).

©2016 About.com. All rights reserved.