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Post by 350guy on Feb 27, 2020 15:04:55 GMT 1
Good day all: I have an oil pump of the RD400. 1A0 is engraved in the pulley and this pump does not have a priming wheel. It has a dot of pink paint on the JIS screw.
Question is, will this work on a 1975 RD350B? If not, what are the parts that need to be replaced in order to make it work?
I am restoring an RD350B and the OEM oil pump is MIA. Thanks for your help.
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Post by reedpete on Feb 27, 2020 23:28:01 GMT 1
The most important marking are not in the pulley but on the plastic gear . Then you need to ensure the worm drive matches the pump. Being larger cylinder you would expect a 400 pump to over oil, but perhaps not by much.
Gary (Arrow ) is the guy to really ask.
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Post by arrow on Feb 28, 2020 1:53:24 GMT 1
Hi, the pink spot 400e/f pump is not suitable the gear inside having 40 teeth. The gear inside the 350b pump should have 55 teeth, it should also have a 521 pulley. I have however seen different gears in these pumps for different markets. Can you post a photo of the wormshaft in a similar fashion to the photo below, so we can double check. Do you have the gear that drives the wormshaft? It should be code; 278 with 21 teeth. Regardless of what you have/don't have, it can be sorted.  |
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Post by reedpete on Feb 28, 2020 12:07:57 GMT 1
It Might be a USA 350B not a UK/EU 350B.
What’s the difference in the second and third photo...no big obvious diferece to the untrained eye?
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Post by arrow on Feb 28, 2020 13:40:57 GMT 1
From top;
1, runs with a 40 tooth gear.
2, runs with a 55 tooth gear.
3, runs with a 62 tooth gear.
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Post by gazzatt2 on Feb 28, 2020 22:02:05 GMT 1
It Might be a USA 350B not a UK/EU 350B. What’s the difference in the second and third photo...no big obvious diferece to the untrained eye? diameter of worm part ? |
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Post by arrow on Feb 28, 2020 23:06:45 GMT 1
Yes, the 250e/f wormshaft at the bottom has a larger diameter at the business end.
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Post by 350guy on Feb 29, 2020 4:37:30 GMT 1
The most important marking are not in the pulley but on the plastic gear . Then you need to ensure the worm drive matches the pump. Being larger cylinder you would expect a 400 pump to over oil, but perhaps not by much. Gary (Arrow ) is the guy to really ask. Thanks Reedpete, much appreciated. |
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Post by 350guy on Feb 29, 2020 4:59:24 GMT 1
Hi, the pink spot 400e/f pump is not suitable the gear inside having 40 teeth. The gear inside the 350b pump should have 55 teeth, it should also have a 521 pulley. I have however seen different gears in these pumps for different markets. Can you post a photo of the wormshaft in a similar fashion to the photo below, so we can double check. Do you have the gear that drives the wormshaft? It should be code; 278 with 21 teeth. Regardless of what you have/don't have, it can be sorted. Good day Garry: Greetings. Many thanks for yours above, very much appreciated. Please see attached. This is the worm gear that I have. Strangely, the plastic helical gear has 4L0 stamped on it, so I assume it it of an LC. I also have a spare plastic helical gear that has 278 stamped on it.  IMG_2576[1] |
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Post by smoker1980 on Jun 16, 2020 5:17:48 GMT 1
The most important marking are not in the pulley but on the plastic gear . Then you need to ensure the worm drive matches the pump. Being larger cylinder you would expect a 400 pump to over oil, but perhaps not by much. Gary (Arrow ) is the guy to really ask. Thanks Reedpete, much appreciated. Hello there,how did you contact Gary for the pump service? Can’t find a contact anywhere. Thanks |
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Post by arrow on Jun 16, 2020 9:58:28 GMT 1
Thanks Reedpete, much appreciated. Hello there,how did you contact Gary for the pump service? Can’t find a contact anywhere. Thanks You can send me a pm. Thanks, Gary. |
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