Can the spark plug tubes be taken out and replaced?
Oct 29, 2019 at 8:35 PM
Spark plug tubes
2004 TOYOTA SIENNA
TONY STALLONE
- MEMBER
- 2 POSTS
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STEVE W.
- ✓ASE Certified Mechanic
- 15,200 POSTS
Welcome to 2CarPros. There are replaceable seals at the top of each of the tubes if they are leaking. That is a common problem with them.
The tubes themselves are a press fit into the head, but they have a glue that bonds them in. It it possible to replace them but it isn't a fun job. You need to use a puller and heat them at the cylinder head to break the glue free, then pull them out. Then you clean up the left over glue and scuff the bores to be sure they are clean. Then you take the new tubes and mark them at 43mm. This is the install depth.
Now you pick one tube, apply the adhesive Three Bond 1324 or Loctite 271 and press it into place to the proper depth. The trick will be pressing it in straight without damaging the tube.
The tubes themselves are a press fit into the head, but they have a glue that bonds them in. It it possible to replace them but it isn't a fun job. You need to use a puller and heat them at the cylinder head to break the glue free, then pull them out. Then you clean up the left over glue and scuff the bores to be sure they are clean. Then you take the new tubes and mark them at 43mm. This is the install depth.
Now you pick one tube, apply the adhesive Three Bond 1324 or Loctite 271 and press it into place to the proper depth. The trick will be pressing it in straight without damaging the tube.
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Oct 29, 2019 at 10:59 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.