Reply
 
Thread Tools Search this Thread Display Modes
 
Old 04-12-2022, 08:08 AM   #1
Member
 
City: RI
Join Date: Apr 2022
Posts: 5
Lehman SP90 Injection pump timing

I am getting ready to take of my injection pump to send for a rebuild. Prior to doing this, I looked over the service manual to learn how top place the engine in proper timing, looks like 20deg before TDC on #1 cylinder. Service manual talks about timing tool 10965. Do i need this or can i just take the timing cover off and look through the hole to line the engine.

page 33 in service manual

http://cworthy.net/boat/documents/Fo...e%20Manual.pdf
Attached Thumbnails
InjectionPumpTiming.jpg   InjectionPumpTiming2.jpg  
phorvati is offline   Reply With Quote
Old 04-19-2022, 11:49 AM   #2
Veteran Member
 
City: Michael
Vessel Name: Piaro
Vessel Model: Rinker 24
Join Date: Apr 2022
Posts: 33
You "can", but that pin also keeps the crank from moving while you are monkeying with the pump. If you can find washers to fit in the hole you can use a piece of threaded rod with a couple nuts with several washers in between, may need to grind the diameter of the rod down. You can also find a bolt that threads into the hole and do the "pencil sharpener" with a grinder and grind a tapered point then screw that in hand tight. Just make sure you're on the compression stroke LOL.
Piaro is offline   Reply With Quote
Old 04-20-2022, 12:11 PM   #3
Member
 
City: RI
Join Date: Apr 2022
Posts: 5
Few things to note. My engine is actually NE90 not SP90 so Atlantic Diesel did not marinize mine.
There was no marking on my pump gear. I ended up getting to TDC, then a mark on the engine crankshaft gear was facing the pump gear. Unfortunately, there was no marking on pump gear. No marking on pump gear anywhere whatsoever along the entire perimeter. I placed a mark using a centerpunch. Injection Pump gear is keyed so there is only one way to come in on the pump. I took off the gear and drive hub and shipped the pump for service. Injection pump service guy walked through the marks with me and I think I should be good.
As far as that tool, I think its fine if it takes me few tries to line up my mark with engine's crankshaft gear mark. We wont know until i put everything back together.
One interesting note is that drive hub (item 2 in pic attached) mounts to IP shaft using the center nut. Ring Gear(item 1) mounts onto drive hub via 4 Retaining screws(hex item 3 in pic). Gear actually has slots where screws go through which allows for fine-tuning. Then retaining plate (item 4) keeps gear from moving along slots. I guess fine tuning cannot be done while engine is idling. This is different from rotary type Injection pump like Lucas CAV DPA that sits on perkins and westerbeake 4-108. That pump you can rotate while engine is idling to fine tune the timing.
phorvati is offline   Reply With Quote
Old 04-20-2022, 10:10 PM   #4
Guru
 
syjos's Avatar


 
City: Gig Harbor
Vessel Name: Sandpiper
Vessel Model: Bluewater 40 Pilothouse Trawler
Join Date: Nov 2012
Posts: 2,315
You can line up the timing marks by eye but make sure you can get your head low enough to not have parallax error. I use a mirror or camera to see the mark through the hole.

You might need to clean rust off to reveal the markings.

I use a bar on the front pulley to turn and hold the crank.
__________________
"My worst day working on the boat is still better than my best day at a job"
syjos is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 06:58 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012