Bad valve seal?

Who did the heads?

Whether it is the stem seal or guide the heads have to be pulled.

Any engine rebuild is more than just a lot of new parts...if the engine builder doesn't know what they are doing those new parts installed become worthless in short order.

 

I would start with the basics..... Leakdown, compression, etc. Call the engine builder and see what they recommend doing.

 

Who did the work?

 

Like everyone else has said, this all depends on who did the work. If they are anyone reputable, then they should stand behind their work. If it was at an authorized dealer, then I believe they have a 5 year warranty on all oem installed parts and labor. Compression and leakdown test for sure.

 

Did he just do the machine work or assemble you a full motor? What is your warranty? Before jumping to any conclusions just have your local tech do a basic series of tests to try and pin point the issue.

 

Let me re-phrase: Who did the work? Where did the parts come from?

 

I see what you did there.

It might not be an isolated incident, I'm afraid.

 

It's either gonna be: parts, workmanship or both.

 

Been around long enough to know who did the work.

It is ur baby now and u are goin to have to pursue someone else to straighten it out.

 

Let's not spend a lot of time trying to crucify the guilty here. Let's identify and fix the problem. Trashing somebody's reputation without hard evidence won't help.

 

Guide seals can be replaced without removing the motor or the head, but it still ain't easy. Here's a step-by-step, condensed.

1. Locate a suitable shade tree to work under, preferably elm, so it doesn't shed or sap on you. If you don't have extensive experience working under these conditions, don't try it.
2. Locate offending seal(s). Spark plug read may tell you that.
3. Remove gas tank, cam belt on offending side. Leave pulleys on cams.
4. Remove cams on that side. It can be done.
5. Remove spark plug, fill cylinder with string, leaving end of string outside motor.
6. Turn motor by hand until string is compressed against valve faces.
7. Remove lifters. Remove valve springs with toolyoumadeyourself consisting of a bent lever and a piece of pipe windowed so you can remove keepers.
8. Remove valve seal with needlenose sparkplugwireremovallooking pliers.
9. Replace seal with suitable tubular tool.
10. Put it back together. Don't forget to remove the string.

 

Wow scariest post ever by Bruce. Ya think dat boyz serious?!

 

Not clear what the string does here..... keep valve from dropping in without the spring?

Impressed that you have done this Bruce! THAT is a real Shade Tree Mechanic! Wow.

 

The string allows you to release the valve keepers and access the guide to replace the seal. The string pushes the valve up so the spring compressor can push the valve down and release the keepers.

Lots of string--like 300ccs of it, not a single thin strand.

 

^^^^ Absolutly!!!! ^^^^



String..Never herd that one before. I always used compressed air but that can be a great asset to have in the arsenal.

 

Nooooo, please tell me it isn't so....

 

Terrible! Sorry to hear this. And only after 2000 miles?

 

I am also sorry to hear about your issues. You are doing others a great service by posting it here to make others aware that this could happen to them. I assume if someone sends you a PM asking which shop it was to save them from accidentally going to it you will let them know in private.