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VP DP-SM Outdrive Cooling Question
I’m going to install a through-hull water pickup to attempt to solve an 8.1 cooling problem (really long story). My question is whether or not I can simply cap off the water intake pipe from the Volvo Penta DP-SM outdrive, or does the outdrive depend on that water intake for cooling?
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Drives will benefit from extra cooling in the housing.
Is there an impellor in the leg, or does it use the raw water pump on the engine to draw it up? With dedicated raw water draw, guys often plumb the drive raw water to a through hull and use it as a drive shower with a through-hull fitting. |
Originally Posted by ChickenSteve
(Post 4945704)
I’m going to install a through-hull water pickup to attempt to solve an 8.1 cooling problem (really long story). My question is whether or not I can simply cap off the water intake pipe from the Volvo Penta DP-SM outdrive, or does the outdrive depend on that water intake for cooling?
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No impeller in outdrive.
There’s a 7 page long thread on this particular engine with lots of photos and detail titled “(Another) 496 overheating issue”. not sure how to add a link to another post |
Originally Posted by ChickenSteve
(Post 4945847)
No impeller in outdrive.
There’s a 7 page long thread on this particular engine with lots of photos and detail titled “(Another) 496 overheating issue”. not sure how to add a link to another post Anyway Here is the link to your other thread: https://www.offshoreonly.com/forums/...at-puzzle.html |
after reading through you original thread with your over heating issue it sound like you replaced everything except your circulating water pump on the front of the motor you do mention that you took it off and apart and every thing looked good. I also had a similar over heating issue and went through pretty much the same process i also took my circulating pump apart and found impeller in good shape and tight on the shaft but since i already had it apart i went ahead and replaced the circulating pump and low and behold it solved my problem i can only think that under load it must be enough to allow the impeller to slip on shaft you might try replace circulation pump first before jumping through any more hoops, i know what your going through chasing a over heating issue drives you crazy good luck.
later |
I guess there’s a chance it’s slipping. I should have scribed a line on shaft and impeller as a reference. Sure don’t see any signs of slipping. What’s another couple hundred at this point. Here’s a before and after cleaning. I had a 19 second video but it was “missing a security token”.
https://cimg8.ibsrv.net/gimg/www.off...1a47f898f.jpeg https://cimg0.ibsrv.net/gimg/www.off...c9e8d60f0.jpeg |
Originally Posted by ChickenSteve
(Post 4945882)
I guess there’s a chance it’s slipping. I should have scribed a line on shaft and impeller as a reference. Sure don’t see any signs of slipping. What’s another couple hundred at this point. Here’s a before and after cleaning. I had a 19 second video but it was “missing a security token”.
https://cimg8.ibsrv.net/gimg/www.off...1a47f898f.jpeg https://cimg0.ibsrv.net/gimg/www.off...c9e8d60f0.jpeg I have taken everything apart, 1988 pump re-circulation that is this has Vanes and is solid the new pump vanes are about 1/4 longer and coated with what looks like some hard coating Boat is only freshwater 112 is not bad for a sierra pump New pair arrived late yesterday..amazon🤣 |
1/4” longer vanes should make a big difference.
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I’ll have a look at Sierra pumps, thanks.
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How about inserting a Y inline between the transom pipe and power steering cooler (first thing the intake water cools) and adding the pickup line there? Would I still need a pressure relief line?
My thought is that would still allow flow through outdrive, and potentially reverse flow as a pressure relief if pickup provides too much pressure. https://cimg7.ibsrv.net/gimg/www.off...8fd449687.jpeg |
Originally Posted by ChickenSteve
(Post 4945932)
I’ll have a look at Sierra pumps, thanks.
But once you get the correct sierra part number from thier website Amazon, west marine. Marine warehouse and a few more have them Just have to find best deal I did Amazon because of speed But it came from the Sierra store there Good luck |
Turns out that Sierra doesn’t carry one, but there are lots of options in the $200 range. Be here tomorrow.
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https://cimg3.ibsrv.net/gimg/www.off...3c8a5c4dc.jpeg
https://cimg5.ibsrv.net/gimg/www.off...8840ec646.jpeg some minor adjustment needed to clear the PS pump bracket. |
https://cimg3.ibsrv.net/gimg/www.off...e8399b224.jpeg
https://cimg4.ibsrv.net/gimg/www.off...93ac0ebbd.jpeg https://cimg5.ibsrv.net/gimg/www.off...93b476a4a.jpeg Inside of circ pump viewed with borescope. One smooth blade and a couple corroded blades. |
Originally Posted by ChickenSteve
(Post 4946594)
https://cimg3.ibsrv.net/gimg/www.off...e8399b224.jpeg
https://cimg4.ibsrv.net/gimg/www.off...93ac0ebbd.jpeg https://cimg5.ibsrv.net/gimg/www.off...93b476a4a.jpeg Inside of circ pump viewed with borescope. One smooth blade and a couple corroded blades. then the new one was wholly cow its got bigger vanes Good you have a new pump |
Well, engine still overheating. Power steering system puking ATF. Also an inch of water in the boat. Not sure where it’s coming from. Power steering cooler doesn’t appear to be leaking ATF or water. No residual drips or anything wet below it. ATF seems to be leaking at a joint in the actuator (newly installed Chinese model). ATF fluid below the actuator. Hydraulic line fittings are clean and dry.
https://cimg0.ibsrv.net/gimg/www.off...a027c0a74.jpeg Wet area below actuator https://cimg8.ibsrv.net/gimg/www.off...fea8edecb.jpeg Small drip on bottom of housing https://cimg9.ibsrv.net/gimg/www.off...0f4c22305.jpeg Fittings and hoses clean |
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No sign of atf or water leakage on ps cooler atf lines or water hoses.
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