TH400 rebuild tech
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(→Boost valve modification) |
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===Boost valve modification=== | ===Boost valve modification=== | ||
| − | Modification of the boost valve to have static line pressure and vacuum | + | Modification of the boost valve to have static line pressure and vacuum modulator replaced with aluminum plug. |
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| + | Grind a flat spot on the large spool valve land with arrow pointed at it. It is not fussy, 1/4 to 3/8 inch wide is fine | ||
[[file:400boost01.jpg]] | [[file:400boost01.jpg]] | ||
| − | Hole location in case to plug. This is shown with the pump removed from the case. | + | Hole location in case to plug. This is shown with the pump removed from the case. This passage must be plugged if boost valve land is ground with flat spot. |
[[file:400boost02.jpg]] | [[file:400boost02.jpg]] | ||
| − | You can remove the valve body and plug this hole shown in photo if pump removal is not going to happen | + | Method 2 to plug passage in case: You can remove the valve body and plug this hole shown in photo if pump removal is not going to happen. Perform this method or the method posted above. Both are not needed |
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| + | You can slip a 1/4 inch check ball into the square hole and push it into the round passage at the base of this square hole. | ||
[[file:400boost03.jpg]] | [[file:400boost03.jpg]] | ||
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