| Author | Message | ||
     David Geach Yet to post message Username: davidgee Post Number: 1 Registered: 02-2022 |
I am in the process of checking the valve tappet clearances on my 1933 20/25, Chassis No GGA60. The Rolls Royce manual specifies 0.003" with the engine cold. I am getting between 0.004" and 0.006" across all 12 valves. I realise that the 0.003" allows for expansion when the engine is hot, and the importance of ensuring the valves close fully. Bearing in mind how fiddly adjusting the clearances can be, is this range of 0.004" to 0.006" acceptable? If not, what is the allowable maximum/minimum clearance I should aim for? David | ||
| Dorien Berteletti New User Username: dorien Post Number: 29 Registered: 01-2013 |
Well the engine will run perhaps a little noisy, but why not do it correctly? It's not that hard and i have no problems setting the valves. Dorien | ||
| Jeff Martin Frequent User Username: jeff_r_1 Post Number: 326 Registered: 07-2018 |
Are the rocker arm ends worn/cupped ? | ||
| ChristopherCarnley Unregistered guest Posted From: 86.182.152.160 |
Being set within the cylinder block, the tappets are very fiddly to adjust especially with oily and perhaps burred nuts. The main thing is to have the valves closed to prevent burning. The handbook reads .004" when cold. (Message approved by david_gore) | ||
| Theo Whitmont Experienced User Username: old_mate Post Number: 76 Registered: 04-2020 |
Gents This is a skill I would love to learn. Are there any instructional videos or other methods to understand more? Many thanks | ||
| David Gore Moderator Username: david_gore Post Number: 4068 Registered: 04-2003 |
Theo, "Ask and ye shall receive" Long time contributor to this section of the Forum Christopher Carnley has asked me to post the the following information from his personal files:  Chris has advised the following additional information: "It is so fiddly and down in the engine, that it is not for anyone with a bad back and a lot of patience is required." . | ||
| Dorien Berteletti New User Username: dorien Post Number: 30 Registered: 01-2013 |
This is amazing, truly amazing! I have the same illustration in my "owners manual". Now on the home page of the Australian Rolls Royce club they have the same manual https://rroc.org.au/wiki/index.php?title=Handbook_for_20/25 And the valve section is in part 3 I think. It's a great club...suggest the interested party become familiar with it. Dorien | ||
| Theo Whitmont Experienced User Username: old_mate Post Number: 77 Registered: 04-2020 |
thanks all for the speedy reply and commentary. All well received. Best wishes to all. |
