Oil Filter Filter Types
In terms of tightening method, Honda filters can be classified into the following three types:
- A type with no figures printed around the bottom. This type of filter should be tightened using a special tool (Oil Filter Wrench T/N 07912-6110001) and a torque wrench.
- A type with numbers from 1 to 8 printed around the bottom. Using the printed numbers as a guide, this type of filter should be tightened 7/8 of a turn from the point where its oil seal touches the engine. The tightening procedure should be performed using a special tool (Oil Filter Wrench T/N 07912-6110001) and a box wrench or socket wrench. A torque wrench is not required.
- A type with numbers from 1 to 4 printed around the bottom. Using the printed numbers as a guide, this type of filter should be tightened 3/4 of a turn from the point where its oil seal touches the engine. A Labinal-Purflux 76 oil filter wrench (commercially available) should be used. (A torque wrench is not required.)
Oil Filter Mounting Surface
Damage or other abnormalities on the threads or oil seal can prevent correct installation of
an oil filter, leading to oil leakage. Before a new oil filter is fitted, it is essential to inspect the
threads on the oil filter and oil path pipe, the rubber seal on the filter, and the mounting
surface on the cylinder block. The following types of abnormality can occur:
Damage to Threads
An oil filter must be screwed onto the engine securely. Any damage to its threads can
prevent correct installation, leading to oil leakage and consequent engine damage or other
serious problems. Before fitting an oil filter, it is essential to check for damage on the female
threads of the filter and on the male threads of the oil path pipe that protrudes from the
engine. The following types of damage can occur:
Knocks and Gouges
Threads can be deformed if they are struck by hard objects. Knocked and/or gouged threads
can be identified visually and by stiffness when the filter is turned by hand. If a filter with
damaged threads is fitted, it is impossible to achieve the correct tightening.
Chipped Crests
The crests of threads are sometimes chipped off. A secure fit between male and female
threads depends on contact between the angled crest surfaces on the male and female
sides. By reducing the contact area, chipped crests weaken the fit and lead to looseness.
Chipped crests are particularly problematic with oil filters since the threads are short.
Cross-threading
If a filter is tightened at an angle, the threads become damaged along their entire length.
Once the thread crests in the oil path pipe become damaged in this way, all subsequently
fitted filters become cross-threaded at the incorrect angle and become difficult to turn.
Abnormalities on Rubber Seal
A rubber seal is fitted at the base of every oil filter to seal the joint between the filter and
engine. Abnormalities in the rubber seal can cause oil leakage. Before fitting an oil filter, it
is essential to check for damage on the rubber seal and the mounting surface on the cylinder
block.
Cuts or Splits
Rubber seals can be cut or otherwise damaged by sharp objects. This type of damage can
be identified visually and by touch.
Gouges
Parts of rubber seals can be gouged out by sharp objects. This type of damage can be
identified visually.
Protrusions
Foreign material behind an rubber seal can cause localized protrusions. This type of
abnormality can be identified visually.
Hardening
To function properly, rubber seals must remain soft and flexible. Unless stored properly,
however, they can become excessively hard. For service personnel to distinguish between
good and excessively hard rubber seals, they must first feel the flexibility of good rubber
seals.
Engine Oil Filter Removal and Installation
CAUTION:
- Oil Filter replacement is usually performed at the same time as oil replacement, for which the engine must be warmed up. Take care not to be scalded by hot oil or engine parts.
- Wear long sleeves, gloves, safety shoes, a cap, and safety glasses.
- After installation, run the engine for a while and check for oil leakage.
NOTE:
Be sure to smear the rubber seal with engine oil, otherwise it may twist and prevent complete sealing of the filter-to-engine joint when the filter is tightened.
Filters with Numbers Printed at the Bottom
When the rubber seal seats, make a mark on the engine in line with any of the numbers printed on the filter using a felt-tip marker. Then, turn the filter until the number before the initial number is aligned with the pen mark. If the initial number is 2, for example, turn the filter until the ‘1’ reaches the pen mark.
Filters with No Numbers
This type of filters should be tightened to a specified torque using a torque wrench.
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Engine