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Two separate oil chambers

G

Ghg

Contributing Member
I have a 1967 Slickcraft SS 165 with a Mercruiser 120. It has two separate oil chambers, upper and lower in the lower unit. Is there any advantage or disadvantage of having two separate chambers? Looks like they went to only one chamber connecting both upper and lower outdrive in around 67 or so.
 
Ghg said:
Is there any advantage or disadvantage of having two separate chambers? Looks like they went to only one chamber connecting both upper and lower outdrive in around 67 or so.
Click to expand...
The Alpha and pre Alpha (MC1) has 2 chambers, which drive are you looking at the had only 1
 
If I recall, there is no way to drain your upper unit without removing the cap & sucking it out.
The later (1967 & up) drives with the interconnected oil chambers filled & drained from the bottom. Also the lower portion was 100% full helping eliminate oil starvation at the bearing just below the water pump.
I believe we discussed this earlier. It's not like you can retrofit because the bellhousing studs are spaced differently pre 1967.
 
Ghg said:
I have a 1967 Slickcraft SS 165 with a Mercruiser 120. It has two separate oil chambers, upper and lower in the lower unit. Is there any advantage or disadvantage of having two separate chambers? Looks like they went to only one chamber connecting both upper and lower outdrive in around 67 or so.
Click to expand...
No advantage, to having two separate chambers. My grandfathers 66 Penn Yann had that on its EZ shift outdrive. The upper has no drain we pull just flush gear lube for one side to the other with it. MC-1 and newer drives had a single lube chamber connected between the halves
 
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