Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 12-06-2013, 09:52   #16
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,363
Re: Volvo MD2B : lost compression in 1 cylinder

My MD2B was a great engine, but I often heard they are a bear to work on or rebuild. All kinds of litle idiosyncrasies to deal with.... goood luck. Do you have the workshop manual?
__________________

__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is online now   Reply With Quote
Old 12-06-2013, 17:26   #17
Registered User

Join Date: Sep 2009
Location: Los Angeles,ca
Boat: Piver Victress 40 - Windhook
Posts: 30
Re: Volvo MD2B : lost compression in 1 cylinder

Ok. Just had to bend the oil pipe a bit to get the head off. My suspicions were correct . Blown head gasket. The reason no water in the oil was that the jackets were dry and not getting any water to begin with, thus the extra heat and blowing the head gasket.

So obviously I need a new head gasket but I'm still trying to figure out the exact water flow path through this engine. As you can see in the pictures the passageways are very corroded and blocked. Most of the blockage however is in the exhaust manifold water supply passages.

I'm thinking of soaking the exhaust manifold in descaler. I'm not sure exactly how to deal with the head and cylinder passageways though. I'd rather not have to take off the cylinder block but also don't want to drop a bunch of crud down in there the cylinder.

Or should I just bit the bullet and take these parts to a machine shop to get them resurfaced or something ?
Attached Thumbnails
Click image for larger version

Name:	IMG_20130612_143120.jpg
Views:	449
Size:	421.6 KB
ID:	62393   Click image for larger version

Name:	IMG_20130612_132508.jpg
Views:	219
Size:	427.6 KB
ID:	62394  

Click image for larger version

Name:	IMG_20130612_143156.jpg
Views:	328
Size:	427.7 KB
ID:	62395   Click image for larger version

Name:	IMG_20130612_143336.jpg
Views:	235
Size:	422.1 KB
ID:	62396  

__________________

__________________
dubhouse is offline   Reply With Quote
Old 12-06-2013, 17:52   #18
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,363
Re: Volvo MD2B : lost compression in 1 cylinder

you've gone this far, pull the other head, clean the block out, and replace both gaskets! maybe a machine shop will boil out those heads?
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is online now   Reply With Quote
Old 12-06-2013, 19:30   #19
Registered User

Join Date: Sep 2009
Location: Los Angeles,ca
Boat: Piver Victress 40 - Windhook
Posts: 30
Re: Volvo MD2B : lost compression in 1 cylinder

What exactly does "boil out" mean ? Do they literally boil them in water or something ? Do they use chemicals at all ? What I really need "boiled out" is the exhaust manifold.
__________________
dubhouse is offline   Reply With Quote
Old 12-06-2013, 20:01   #20
Guy
Registered User

Join Date: Feb 2013
Location: So. Oregon, USA
Boat: Seafarer36c
Posts: 4,308
Re: Volvo MD2B : lost compression in 1 cylinder

"Boil out" is an old term used when they would put the part in a tank of hot solvent and it would disolve carbon. Now days they mostly use more sophisticated spray booths. If all you need is some scale removed from the exh manifold a radiator shop could do it or you could use a screwdriver and poke it out, You could get it bead blasted too.
__________________
Guy is offline   Reply With Quote
Old 12-06-2013, 20:13   #21
Registered User

Join Date: Nov 2011
Location: Montegut LA.
Boat: Now we need to get her to Louisiana !! she's ours
Posts: 3,421
Re: Volvo MD2B : lost compression in 1 cylinder

At least get a shop to ck the heads for warpage. No sence putting new gaskets on warped heads! while there get em bead blasted to remove the scale. Just my 2 cents
__________________
Bob and Connie
bobconnie is offline   Reply With Quote
Old 13-06-2013, 15:20   #22
Registered User

Join Date: Sep 2009
Location: Los Angeles,ca
Boat: Piver Victress 40 - Windhook
Posts: 30
Re: Volvo MD2B : lost compression in 1 cylinder

It doesn't seem like any local shops do boil outs. I wonder if I soaking in muriatic acid would do the trick. If not soaking, at least filling up the clogged pathways with the stuff and letting it sit.

Does anybody know how to do a boil out ?
I looked up bead blasting but I couldn't find anybody in the area either. And I'm in los angeles county !

I'm taking the head to a shop today.
__________________
dubhouse is offline   Reply With Quote
Old 14-06-2013, 16:52   #23
Registered User

Join Date: Jun 2011
Posts: 37
Soak the head and manifold in muriatic acid diluted at least 50% with water. Available at Home Depot or Lowes, usually in the paint section. Will foam sizzle and bubble as it dissolves the salt and scale blocking the passages. Had to do several times on a couple of MD7As I rebuilt. Be sure to neutralize the acid with a thorough water wash down.
When you put it all back together, hook up a 12 volt pump and circulate a fresh batch of the solution through the block for an hour or two. This will clean the passages in the block.
Hook the intake side of the pump to a hose that goes to the bucket. The output side goes to the raw water intake on the engine (after the raw water pump). Then run a hose from the raw water output on the exhaust manifold back to the bucket to complete the circuit. Don't forget to remove the thermostat for this process. When done, flush well with fresh water and replace the thermostat. I do this once a year with my raw water cooled Volvos and have not had an over heating problem since adding this to my maintenance schedule.
__________________

__________________
poboy is offline   Reply With Quote
Reply

Tags
compression, lost, md2b, volvo

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 11:16.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.