Logo
FULL SITE MENU

Got a question about remote oil filter kits…

L

louc

Regular Contributor
OK I bought a remote oil filter kit from Michigan Motors for my 88 4.3. Question; some say it’s necessary to change the 11 lb bypass valve in the oil filter mount pad to a 30 psi unit. This is supposedly to keep the oil from by passing the filter. The hoses of the remote mount can cause extra resistance to flow. However some including Michigan Motorz who sells many engines with these remote kits say not it is not necessary. Thoughts?
 
louc said:
OK I bought a remote oil filter kit from Michigan Motors for my 88 4.3. Question; some say it’s necessary to change the 11 lb bypass valve in the oil filter mount pad to a 30 psi unit. This is supposedly to keep the oil from by passing the filter. The hoses of the remote mount can cause extra resistance to flow. However some including Michigan Motorz who sells many engines with these remote kits say not it is not necessary. Thoughts?
Click to expand...

I say use as is. A typical stock V6 or V8 runs around 40-50psi.

I believe the bypass pressure is around 10-15 psi. I forget.

I never worried about that.

If the oil pump works good then it doesnt know or care if its driving the oil thru any hoses to a filter.
It pushes the oil thru a push rod...so it can easily push it thru a 1/2 " diameter hose a few feet...
 
Yep thanks that was my thought as well. But this “you gotta use a 30 psi bypass valve” thought seems to be floating around the internet mostly in reference to Big Block Chevrolets. You know I saw the parts that go into a Mercruiser accessory remote kit for the 4.3 & I didn’t see a new oil pressure bypass valve as part of it.
 
I asked the guys at Michigan Motorz & the said it’s not necessary to change that bypass valve. They sell a lot of remote oil filter kits with their turn key engines. I’d think if there was a problem with oil not getting filtered they’d hear it from their customers sooner or later…
 
I installed one on my boat because I had to hang upside down to change the filter.
I made mine at a Napa store a friend managed back then. Bought the adapfor for block, made two high pressure hoses and made the mounting bracket for the elbow mounting location. Works well!
Been running the remote set up since 1996.
So far no issues....

Makes for filter change as easy as it can be. Kneeling on the back bench seat.
No fuss or mess!!
 
louc said:
...some say it’s necessary to change the 11 lb bypass valve in the oil filter mount pad to a 30 psi unit. This is supposedly to keep the oil from by passing the filter....
Click to expand...
The oil bypass valve (in the block) is there to open if the filter gets restricted, to allow oil to flow into the engine (vs burst the shell of the filter or unseating its gasket)...no need to change anything there...
 
I did some more research to see how the OEMs set up their remote oil filters....
Merc's accessory kits don't appear to include a different bypass valve
I also looked at a Crusader catalog, they don't either for the engines that have only a remote oil filter
On engines that have both a remote oil filter and a remote oil cooler, they change the bypass valve to a 20 psi unit which makes sense since the cooler adds some more resistance to flow.
So I think I should be fine doing it this way.
 
macombmarineparts.com

Crusader Model 454 - 454 C.I.D/7.4L - Remote Oil Filter Assembly

Crusader Model 454 - 454 C.I.D/7.4L - Remote Oil Filter Assembly | Illustrated Parts Diagram | Shop for Crusader Marine Parts at MacombMarineParts.com Today!
macombmarineparts.com macombmarineparts.com
part # 2 is the bypass valve , when you google this part number you find it is a 20 psi bypass valve
the engines with no oil cooler just the remote filter set up don't list this different psi bypass valve
Crusader part # 98173
 
The 4.3 litre and most SBC V8's do not use a Oil Cooler. They only use a power steering cooler.

Based on ealier info posted,

Stock ooens at about 15 psi
Opens if filter clogs.
No oil cooler (4.3 liter)

The one you posted,
Opens at 20 psi
Opens if filter clogs
engine Oil cooler or trans oil cooler (inboards)
454-7.4 liter

Not sure what you are trying to prove or justify???

Its your boat, change it if you want.

Most boats get used 3-6 months a year.
Oil and filter get changed typically once a year.

Odds of filter getting clogged is close to Zero unless engine internals are degrading.

If your running year round and running in the ocean with a heavy load all the time such as a fishing or lobster boat, maybe the extra 5 psi may have a purpose...unless running a Bigblock or trans cooler on a Small block

I would not be concerned and use the parts as is. The extra 4-6 feet of free flowing hose is a non issues.
JMHO
 
louc said:
macombmarineparts.com

Crusader Model 454 - 454 C.I.D/7.4L - Remote Oil Filter Assembly

Crusader Model 454 - 454 C.I.D/7.4L - Remote Oil Filter Assembly | Illustrated Parts Diagram | Shop for Crusader Marine Parts at MacombMarineParts.com Today!
macombmarineparts.com macombmarineparts.com
part # 2 is the bypass valve , when you google this part number you find it is a 20 psi bypass valve
the engines with no oil cooler just the remote filter set up don't list this different psi bypass valve
Crusader part # 98173
Click to expand...
Lou: tnx for the links but I'd say there isn't enough there to reach a positive definite conclusion about the bypass valves being different...The big block diagram referenced is for the newer GENV blocks...there was no separate bypass valve shown on the older MarkIV diagram or, as you noted, for the older SBCs...

I din't think 5 PSI is going to matter, especially on a differential valve...the other thing to consider is if the filter itself has a bypass internal...
 
My thought was that if Crusader didn’t change the bypass when only adding a remote filter then it wasn’t necessary for me either which is what you both & the people who sold me the kit felt. I guess Crusader thought when you have both a remote filter mount & an oil cooler it is necessary to change to the higher psi bypass. Like most mine has no oil cooler…
 
makomark said:
Lou: tnx for the links but I'd say there isn't enough there to reach a positive definite conclusion about the bypass valves being different...The big block diagram referenced is for the newer GENV blocks...there was no separate bypass valve shown on the older MarkIV diagram or, as you noted, for the older SBCs...

I din't think 5 PSI is going to matter, especially on a differential valve...the other thing to consider is if the filter itself has a bypass internal...
Click to expand...
The fact that’s there’s no separate bypass valve listed suggests that the standard adapter with the 11 psi valve is what was used; when there was only a remote oil cooler but again I’m making some assumptions here. I was really just trying to figure out what the OEMs did with their remote filter set ups.
 
Back
Top