Foam O. Trans dip stick

[Chasemmc]

Allison m20 behind 8v92ti. Stbd oil level low mark when cold. Oil honey color. Idled the engine 1/2 hour periodically running to 1000 rpm. Oil level rose to 1/2 between full and low but foamy oil dip stick. Added 1 qt 40w, oil level at full foamy.I have read that if overfilled will cause foaming, but under filled? Temps: at brass fitting to trans oil filter 125 by infrared. Lower er gauge - 137. Lower helm - 150

[saltshaker]

Allison m20 behind 8v92ti. Stbd oil level low mark when cold. Oil honey color. Idled the engine 1/2 hour periodically running to 1000 rpm. Oil level rose to 1/2 between full and low but foamy oil dip stick. Added 1 qt 40w, oil level at full foamy.I have read that if overfilled will cause foaming, but under filled? Temps: at brass fitting to trans oil filter 125 by infrared. Lower er gauge - 137. Lower helm - 150

Could be getting air through the suction side, over filled or the gear is whipping up the oil. There’s a guard above one of the gears in the trans. If that has shifted this will happen but it’s rarely the issue.

[Chasemmc]

Do u think operating the transmission will damage it?

[saltshaker]

Typically no but can’t say without knowing what’s really going on

[Chasemmc]

The operating temp at the sea trail was 153 degrees. I'll monitor while operating. It shifts fine. Wasn't there a good Allison shop in Alabama mentioned in the forum. Maybe I can call them, anyone remember the name?

[MagnaBill]

The operating temp at the sea trail was 153 degrees. I'll monitor while operating. It shifts fine. Wasn't there a good Allison shop in Alabama mentioned in the forum. Maybe I can call them, anyone remember the name?

Acadian Marine Transmission ask for Brian. Broussard, Louisiana. His knowledge is amazing.