Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 13-10-2009, 13:44   #1
Registered User

Join Date: Oct 2009
Location: East Coast UK
Boat: Hallberg Rassy 29
Posts: 8
Hand Cranking Volvo MD7B

I have just acquired a 1983 boat with its original Volvo MD7B engine. The engine is in good condition. I got a new hand crank from Volvo. However, the new hand crank is very tight on the crank shaft (I assume that is what the hand crank fits on to?) and though it will turn the fly wheel very well it is difficult to get the hand crank off.

Could someone please advise:

1. How loose is the hand crank supposed to be and is it dangerous to be tight?

2. What is the correct procedure for starting the engine using the hand crank. Should the ignition be on, should the throttle be open and if so how much?

Im a bit nervous to try it without a bit more information having read of people losing thumbs etc.

Many thanks.

kene66 is offline   Reply With Quote
Old 13-10-2009, 13:52   #2
Registered User
S/V_Surya's Avatar

Join Date: Mar 2009
Location: Sasafra river,MD
Boat: gulfstar ketch 41 Surya
Posts: 667
I had a volvo md6b with hand crank. The crank went on a cam shaft above the fly wheel. The crank handel was very loose and had a lobe to disengage when the engine would run. The procedure was to put throttle at 3/4, turn key on, and release compression. Spin as fast as possible and close compression lever.
Hope this helps.

S/V_Surya is offline   Reply With Quote
Old 13-10-2009, 13:54   #3
Registered User
Solitude's Avatar

Join Date: Nov 2008
Location: West Coast, BC , Canada
Boat: Cascade
Posts: 595
I have a hand crank with my Yanmar. Its a spin off type so when the motor moves faster than the crank it pops off. You dont want it to stick on!!!

The instructions read ...

Turn the ignition on (you dont want to wreck the aternator)
Open the decompression lever
Turn as fast as you F*%n can
Let the decompression lever go.

I have never been able to get it to go fast enough to start. I just make shure my seperate start battery is in good shape.
Go outside and PLAY!
Solitude is offline   Reply With Quote
Old 13-10-2009, 14:30   #4
Moderator Emeritus
Boracay's Avatar

Cruisers Forum Supporter

Join Date: Feb 2004
Location: Pelican Bay, Great Sandy National Park
Boat: Steel Roberts Offshore 44
Posts: 5,174
Images: 18
Please be careful here...

Too many years ago I had a Yanmar 7hp hand start in my RORC 32'. Great engine, easy to start.
I found a diagram for the MD7B hand crank here.
Your Volvo looks to be the twin cylinder 17hp engine, which is of a size that could be difficult to hand start.

The hand crank does not go on the crankshaft, but on a special hand start shaft (labeled 12 in the diagram referenced above.). This shaft (if similar to my old Yanmar) should be fitted with a ratchet so that it will turn the engine over one way but spin freely the other. This is essential if your hand, gripping the starting handle firmly, is not to be removed from your arm when the engine fires.
I could not find any direct reference to hand starting your Volvo, other than a suggestion that "the truth is, that beast took everything I have..". and related comments.
It would probably be best if you contacted your local Volvo dealer/mechanic. They should be able to give you a proper briefing on decompression, injector pump settings, throttle settings, correct technique, safety precautions and first aid.
Boracay is offline   Reply With Quote
Old 13-10-2009, 15:31   #5
Senior Cruiser

Cruisers Forum Supporter

Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 17,316

The handle to be lose on the wheel - your wheel or handle must have paint on the adjacent parts - clean them and give them some grease - they must be free do disengage.

0) Gears in neutral,
1) If you have an engine battery switch - keep it ON (as if starting by starter),
2) The key in the ON pos (the one just next to START) - it is two clicks to the right on my panel,
3) Decompression lever - on the UP position (decompressed),

In this position you can easily turn the engine by hand - just pushing on the flywheel.

4) Handle in, give it a couple of quick turns - till it does not get any faster,
5) Now when it is in the full swing - decompression lever down, PUF, PUF, PUF ...
6) Job done!

Very easy.

Note - there is a special way of holding the handle - with the thumb facing along with the other fingers - ask someone to show you the trick - you want to avoid the situation when the engine kicks and you get your thumb bruised.

barnakiel is offline   Reply With Quote
Old 13-10-2009, 20:05   #6
Senior Cruiser
roverhi's Avatar

Cruisers Forum Supporter

Join Date: Aug 2005
Location: Kona, Hawaii, Carlsbad, CA
Boat: 1969 Pearson 35 #108 & 1976 Sabre 28
Posts: 6,128
Send a message via Yahoo to roverhi
I handcranked an MD2B for nearly 10 years. That engine looks like the older brother of yours. The 2B had a cold start button on the back of the engine, if yours does, depress it and will stick down. Put the decompression levers vertical. If the boat is in a slip, trans in neutral. Crack the throttle open a bit. Start cranking the engine until you get as much RPM as you can crank into it. simultaneously, disconnect the crank and drop one of the compression levers. Engine should start on one cylinder on the first try. Drop all the rest of the compression levers and you are up and running. I hand cranked a 1, 2 , and 3 cylinder versions of the Volvo MD series of engines. The one cylinder was super easy to start, the two cylinder was easy to start, the 3 cylinder was a workout because of the friction and inertia of getting all three cylinders spinning. You probably should have the ignition on as I think there was a solenoid fuel shut off and the warning buzzers won't work. If there is a manual fuel shutoff, you don't need the ignition on.

If you are sailing, it's a lot easier to hand crank the engine with the transmission in forward. Almost like a push start as the water passing over the prop takes most of the effort out of it.

On the 2b, the crank goes on what I believe is the end of the cam. It was about the two o'clock position above the flywheel. The crank should be lose on the cranking shaft as you have to pull it off or it will thrash about on it's own as the engine starts. With a diesel, you don't have to worry about the engine firing backwards breaking your wrist. You really aren't cranking as you initiate the ignition cycle by dropping the compression release.

FWIW, I was always in the tropics starting the engine. Don't know how much fun it would be handcranking a cold engine in Barrow, AK.
roverhi is offline   Reply With Quote
Old 13-10-2009, 22:57   #7
Registered User

Join Date: Oct 2009
Location: East Coast UK
Boat: Hallberg Rassy 29
Posts: 8
What an excellent series of truly helpful and informative answers. Thank you ALL!

kene66 is offline   Reply With Quote


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
My MD11C volvo needs a hand crank for manual starting froggman180 Engines and Propulsion Systems 14 27-04-2009 10:00
Damage from cranking engine? andrejsv Engines and Propulsion Systems 4 30-07-2008 00:32
take me by the hand darkmetal Monohull Sailboats 16 14-12-2007 08:39
hand cranking a 52hp yanmar 4JH2E rebel heart Engines and Propulsion Systems 10 15-11-2007 16:52
Hand crank assembly for a Volvo MD11C froggman180 Engines and Propulsion Systems 0 03-09-2005 00:39

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:39.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.