D24T.com  

Go Back   D24T.com > Technical Discussion Area > Diesel Engine and Drivetrain

Reply
 
Thread Tools Display Modes
  #1  
Old 06-08-2016, 07:29 AM
monkeh monkeh is offline
Member
 
Join Date: Jan 2016
Location: Newport, Wales. UK
Vehicle: 940 d24tic
Posts: 33
Default Some help locating TDC

I need to remove the head on the 760, I dont have any access to any specialist tools.
I cant find any timing marks on the crankshaft pulley at the front. The only timing marks I 'think' I can find are on the back of the engine, and the fuel pump.

Anything down below I can use as a reference to set it at TDC?


I cant find the line on the guard of the pump belt, But there is a notch on the pulley that lines up with this part of the guard...



And is this the correct position for the pump timing?

Reply With Quote
  #2  
Old 06-08-2016, 07:43 AM
v8volvo v8volvo is offline
Supporting Member
 
Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
Posts: 1,618
Default

Quote:
Originally Posted by monkeh View Post
I need to remove the head on the 760, I dont have any access to any specialist tools.
You will need to eventually get the tools to put it back together successfully. There are no shortcuts to get by without them. Unless you get one-in-a-million luck your best case result trying to do this job without timing tools is incorrect timing and an engine that doesn't run as well as it should. Worst case is mechanical damage to the motor. Fair warning.

However, in the meantime if you just want to get it generally close to TDC to disassemble and get the tools only later on when you're putting it back together, using the mark on the pump is a good method. Line up the sprocket notch with the notch on the pump housing (not the notch on the pump mounting bracket that has paint on it in your photo -- the pump notch is on the ear of the pump, behind the fuel hose in the photo), and you're there, close enough for pulling it apart.
__________________
86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
Reply With Quote
  #3  
Old 06-08-2016, 10:05 AM
monkeh monkeh is offline
Member
 
Join Date: Jan 2016
Location: Newport, Wales. UK
Vehicle: 940 d24tic
Posts: 33
Default

Thanks, I think I'll get it towed down to a garage once the heads back on, they managed to change the belts with no issues.
I'm a bit dubious about doing the timing myself.

Last edited by monkeh; 06-08-2016 at 10:16 AM.
Reply With Quote
  #4  
Old 06-08-2016, 11:20 AM
ngoma ngoma is offline
Supporting Member
 
Join Date: Nov 2009
Posts: 1,351
Default

What about the flywheel mark?
__________________
1985 744 gle d24t
1985 745 gle d24t
Reply With Quote
  #5  
Old 06-08-2016, 12:57 PM
v8volvo v8volvo is offline
Supporting Member
 
Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
Posts: 1,618
Default

Quote:
Originally Posted by ngoma View Post
What about the flywheel mark?
Works, but much harder to find, and possible to get it set to TDC 180* off unless using a cam reference as well. (Looks like the valve cover is removed so that would be an option though.) For finding TDC to an approximate degree for disassembly I think using the IP reference is fine and easier, precision of the crank method doesn't hurt but it's not necessary.

It is required for setting timing upon reassembly though.
__________________
86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
Reply With Quote
  #6  
Old 06-08-2016, 01:39 PM
v8volvo v8volvo is offline
Supporting Member
 
Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
Posts: 1,618
Default

Quote:
Originally Posted by monkeh View Post
Thanks, I think I'll get it towed down to a garage once the heads back on, they managed to change the belts with no issues.
I'm a bit dubious about doing the timing myself.
Seems like a solid plan, if they are capable diesel mechanics I imagine they should be able to time it without issue.

You will want to ensure that they have the correct tools for putting proper torque on the front crankshaft dampener bolt though. Even if they have the skills and *enough* of the tools to set timing correctly (this can be done with the same stuff that works on diesel VWs and anything with a Bosch rotary pump, very common), and are able to get it all timed and running perfectly as they did before, that is all only temporary if the front bolt isn't done right, which *cannot* be done with anything other than the correct special tools (or some kind of homemade variant built to do the exact same thing). Insufficient torque on this bolt inevitably leads to slipped timing and a wrecked motor. Numerous examples of this scenario just on this board, in the few hundred folks who are here. It's one of the most common killers of these engines due to the absolute necessity of the tools, but it is very easily avoided.

Best bet if you can do it is likely to get your hands on the tools -- if you've got the know-how to swap the head you will certainly have no trouble doing the timing yourself once you have the needed equipment, and then you will know for sure that it is done right and save some $. Plenty of folks here have them and are willing to loan, or overseas where you are, you can probably get them from other sources too.

Or if you'd rather skip the timing procedure, and want to have it done elsewhere, make sure the folks you use have the needed tools. If they don't, get the tools and provide them for their use, or find someone else who has them. Added hassle but given the work you are about to put in, you don't want to let one bolt put the whole motor at risk.
__________________
86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k

Last edited by v8volvo; 06-08-2016 at 01:43 PM.
Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -8. The time now is 01:39 AM.


Powered by vBulletin® Version 3.8.10
Copyright ©2000 - 2024, vBulletin Solutions, Inc.