| Fig. 1: B Series Pick-up exhaust system — 2.3L
engine
|
| Fig. 2: B Series Pick-up exhaust system — 2.5L
engine
|
| Fig. 3: MPV exhaust system — 2.6L
engine
|
| Fig. 4: MPV exhaust system — 3.0L
engine
|
| Fig. 5: B Series Pick-up and Navajo exhaust system — 3.0L
and 4.0L engines
|
There are basically two types of exhaust systems. One is the flange type where the component ends are attached with bolts and a gasket in-between. The other exhaust system is the slip joint type. These components slip into one another using clamps to retain them together.
CAUTION
Allow the exhaust system to cool sufficiently before spraying a solvent
onto exhaust fasteners. Some solvents are highly flammable and could
ignite when sprayed on hot exhaust components.
Before removing any component of the exhaust system, ALWAYS squirt a liquid rust dissolving agent onto the fasteners for ease of removal. A lot of knuckle skin will be saved by following this rule. It may even be wise to spray the fasteners and allow them to sit overnight.
| Fig. 6: Nuts and bolts will be extremely difficult
to remove when deteriorated with rust
|
CAUTION
Do NOT perform exhaust repairs or inspection with the engine or exhaust
hot. Allow the system to cool completely before attempting any work.
Exhaust systems are noted for sharp edges, flaking metal and rusted
bolts. Gloves and eye protection are required. A healthy supply of penetrating
oil and rags is highly recommended. Never spray liquid rust dissolving
agent onto a hot exhaust component.
| Fig. 7: Example of a flange type exhaust system
joint
|
Before removing any component on a flange type system, ALWAYS squirt a liquid rust dissolving agent onto the fasteners for ease of removal. Start by unbolting the exhaust piece at both ends (if required). When unbolting the headpipe from the manifold, make sure that the bolts are free before trying to remove them. if you snap a stud in the exhaust manifold, the stud will have to be removed with a bolt extractor, which often means removal of the manifold itself. Next, disconnect the component from the mounting; slight twisting and turning may be required to remove the component completely from the vehicle. You may need to tap on the component with a rubber mallet to loosen the component. If all else fails, use a hacksaw to separate the parts. An oxy-acetylene cutting torch may be faster but the sparks are DANGEROUS near the fuel tank, and at the very least, accidents could happen, resulting in damage to the under-car parts, not to mention yourself.
| Fig. 8: Example of a common slip joint type system
|
Before removing any component on the slip joint type exhaust system, ALWAYS squirt a liquid rust dissolving agent onto the fasteners for ease of removal. Start by unbolting the exhaust piece at both ends (if required). When unbolting the headpipe from the manifold, make sure that the bolts are free before trying to remove them. if you snap a stud in the exhaust manifold, the stud will have to be removed with a bolt extractor, which often means removal of the manifold itself. Next, remove the mounting U-bolts from around the exhaust pipe you are extracting from the vehicle. Don't be surprised if the U-bolts break while removing the nuts. Loosen the exhaust pipe from any mounting brackets retaining it to the floor pan and separate the components.
