VP heat exchanger end cap bolts
- Thread starter raptorheli2
- Start date
starfire
Well-Known Member
Just passivated steel.
madabouttheboat
Well-Known Member
Why risk it. Just buy original replacements.
raptorheli2
Active Member
2 reasons mainly.
1. I needed them quickly (which I've now got)
2. No one wants to pay volvo penta tax for a bolt in a packet.
6x bolts and 3x O rings from volvo to fix the exchanger would have been £ £110.
Local hydraulic place had the seals and same bolts £23 total
Ironic as the reason I'm fixing it is volvo kindly stripped the bolt on it when it was made and painted over it.
1. I needed them quickly (which I've now got)
2. No one wants to pay volvo penta tax for a bolt in a packet.
6x bolts and 3x O rings from volvo to fix the exchanger would have been £ £110.
Local hydraulic place had the seals and same bolts £23 total
Ironic as the reason I'm fixing it is volvo kindly stripped the bolt on it when it was made and painted over it.
madabouttheboat
Well-Known Member
Although £40 for 6 screws does seem a tad excessive, in the grand scheme of things it is a drop in the ocean to ensure you get the right material. Galvanic corrosion on your heat exchanger could end up costing over £2.5K.2 reasons mainly.
1. I needed them quickly (which I've now got)
2. No one wants to pay volvo penta tax for a bolt in a packet.
6x bolts and 3x O rings from volvo to fix the exchanger would have been £ £110.
Local hydraulic place had the seals and same bolts £23 total
Ironic as the reason I'm fixing it is volvo kindly stripped the bolt on it when it was made and painted over it.
vyv_cox
Well-Known Member
The bolts hold the end cap on. They should not come into contact with any liquid.
raptorheli2
Active Member
Correct, should be zero water
madabouttheboat
Well-Known Member
Correct, should be zero water
Should, being the important word. A slight weep on the end cap is all that it would take. Or a leak anywhere near on the engine, or just one of those salty damp engine bays that boats often have.
raptorheli2
Active Member
I'll worry about it in 10 years then
vyv_cox
Well-Known Member
There must be billions of similar arrangements around the world - not just in yacht engines but in every engineering construction you can think of. How many experience disastrous failures? Very, very few.
madabouttheboat
Well-Known Member
All im saying, having seen how quickly these housings, that cost thousands, can corrode, why take the risk using potemtially bolts of the wrong material to save maybe £30.
raptorheli2
Active Member
Dude, it's a bolt that was replaced with a suitable one, not a b&q special.
This might come as a surprise, volvo do not make bolts, paints, antifouls, oils, filters, anti freeze, timing belts, pistons, bearings etc etc.
This might come as a surprise, volvo do not make bolts, paints, antifouls, oils, filters, anti freeze, timing belts, pistons, bearings etc etc.
rogerthebodger
Well-Known Member
Corrosion only takes place when you have 2 dissimilar metals electricity connected together in an electrolyte (sea
water)
As there should be no electrolyte in the cap screw threads there should be no corrosion.
I did have an aluminum heat exchanger corrode due to a failure of the end cap seal
Check for any seawater leakage
I had my heat exchanger welded up and hand fled back to the required shape
water)
As there should be no electrolyte in the cap screw threads there should be no corrosion.
I did have an aluminum heat exchanger corrode due to a failure of the end cap seal
Check for any seawater leakage
I had my heat exchanger welded up and hand fled back to the required shape
PetiteFleur
Well-Known Member
Slightly off topic, my early Beta 25hp has a heat exchanger with a single central bolt for the end caps. One just snapped on first start after launch - fortunately I had the hatch open and immediately stopped the engine. Beta recommend these bolts are replaced every 10 years. Mine were 12 yrs old so replaced both - some bronze I believe.
rogerthebodger
Well-Known Member
The same thing happened to mine some time ago again causing corrosion due to seawater attacking the aluminum
raptorheli2
Active Member
Unfortunately we haven't found much yet we can put in contact with salt and not corrode to some extent.
My boat is dry stacked so does help.
My boat is dry stacked so does help.